Astronomers' Favorite Twitter Feeds

Updated: 2019-Jan-17 00:41 UTC. Listed feeds: 300. A feed's score is the percentage of Astronomers on Twitter following it, and dark shading indicates the feed belongs to a member of that list. Switch to collage. List only feeds under 1,000 followers. Feedback: @TrueSciPhi.

#Twitter profileTwitter
1.profile imageKatie Mack

(a.k.a. Dr Katherine J Mack) astrophysicist/cosmologist, occasional freelance science writer, connoisseur of airplane food
Raleigh, NC
9 yrs, 8 mos on Twitter
291,717 72.7%
2.profile imagePhil Plait

SCIENCE! I love this stuff. My Bad Astronomy blog: syfy.com/badastronomy I use "likes" for bookmarks. No endorsement implied.
Bad Astronomy
11 yrs, 9 mos on Twitter
612,068 67.6%
3.profile imageNASA

Explore the universe and discover our home planet with @NASA. We usually post in EST (UTC-4)
11 yrs, 0 mos on Twitter
30,186,604 67.0%
4.profile imageEmily Lakdawalla

Senior Editor & Planetary Evangelist, The Planetary Society. Planetary scientist. Asteroid 274860. Views are my own & not those of employer.
The Design and Engineering of Cur...
Pasadena, CA
10 yrs, 8 mos on Twitter
154,044 66.8%
5.profile imageNeil deGrasse Tyson

Astrophysics for Young People in ...
Accessory to War
StarTalk Young Readers Edition
New York City
9 yrs, 11 mos on Twitter
13,086,349 60.1%
6.profile imagechrislintott

Astronomer, zookeeper and journalist, based at University of Oxford.
The Cosmic Tourist
Exploring the Mysteries of the Un...
10 yrs, 3 mos on Twitter
29,131 58.2%
7.profile imageDr./Prof. Sarah Hörst

Asst Prof of Planetary Sci @JohnsHopkins and Titan evangelist. “I try not to hope and fail utterly” [email protected]nkjemisin. she/her https://t.co/KTdjavkCds
Baltimore, MD, USA
9 yrs, 9 mos on Twitter
49,314 55.5%
8.profile imageSarah Kendrew

Astronomer with the European Space Agency. Based at the Space Telescope Science Institute in Baltimore. Astronomy, running, bikes. Opinions my own. 🇧🇪🇬🇧
11 yrs, 4 mos on Twitter
8,165 55.5%
9.profile imageBarack Obama

Dad, husband, President, citizen.
Washington, DC
11 yrs, 10 mos on Twitter
104,214,734 55.2%
10.profile imageCuriosity Rover

Your friendly neighborhood NASA Mars rover. Exploring the Red Planet since 2012. Team headquartered at NASA's Jet Propulsion Laboratory 🚀 @NASAJPL
Gale Crater, Mars
10 yrs, 6 mos on Twitter
3,970,503 53.9%
11.profile imageAstrotweeps: Admins

Admins • @astrotweeps • https://t.co/VbzNcTyVyG • A new astronomer/planetary scientist tweeting about space each week.
The Universe
5 yrs, 0 mos on Twitter
9,608 53.6%
12.profile imageDavid W Hogg

astronomy, cosmology, stars, exoplanets, inference, engineering, data analysis, emcee, The Cannon, Astrometry.net, The Tractor, #openscience, #otherpeoplesdata
New York City
7 yrs, 9 mos on Twitter
6,385 53.4%
13.profile imageLucianne Walkowicz

Astronomer @AdlerPlanet, 5th Chair of Astrobiology @librarycongress, multimedia artist. Ethics of Mars exploration, exoplanets, social justice. Opinions my own.
Chicago, IL
7 yrs, 11 mos on Twitter
13,768 53.1%
14.profile imageSarah Tuttle

Astrophysicist. We're not going to be shady, just fierce. Professor. Rudderless Conan w/ magic powers you don’t quite understand. 100% problematic. She/they.
Here, I guess.
11 yrs, 0 mos on Twitter
11,851 52.8%
15.profile imageJulianne Dalcanton

Astrophysicist at the University of Washington. Principal Investigator of the Panchromatic Hubble Andromeda Treasury (PHAT).
7 yrs, 0 mos on Twitter
6,649 52.8%
16.profile imageAstroBetter

Blog and Wiki for professional astronomers.
9 yrs, 9 mos on Twitter
5,015 52.3%
17.profile imageastrobites

Digestible summaries of the latest research in astrophysics, written by graduate students. Astrobites is supported by the American Astronomical Society.
All over the world
8 yrs, 0 mos on Twitter
8,263 51.2%
18.profile imageAstronomy Picture Of The Day

Each day a different image of our universe along with a brief explanation. For issues with this account contact @astronomyblog otherwise apod.nasa.gov/apod/lib/apsub…
11 yrs, 4 mos on Twitter
1,288,537 50.9%
19.profile imageMaria Womack

Astrophysicist & planetary scientist, USF Professor #teamcomet #astrochemistry #scipolicy #climatechange #planetarydefense Contains no pseudoscience
9 yrs, 5 mos on Twitter
4,416 50.4%
20.profile imageBryan Gaensler 📡🧲

Astronomer, Professor, Director of @DunlapInstitute at @UofT. Sci-fi connoisseur, rugby league tragic, displaced Antipodean, bewildered parent. Opinions ∉ @UofT
Extreme Cosmos
Toronto, Canada
9 yrs, 5 mos on Twitter
9,087 49.9%
21.profile imageSpaceX

SpaceX designs, manufactures and launches the world’s most advanced rockets and spacecraft
Hawthorne, CA
9 yrs, 8 mos on Twitter
7,795,941 49.6%
22.profile imageJonathan McDowell

I'm an astronomer at the Harvard-Smithsonian Center for Astrophysics, working on Chandra and quasars, and commenting on space launches and space activities.
Somerville, MA, USA
9 yrs, 11 mos on Twitter
26,641 49.3%
23.profile imageBrian Cox

Touring the world in 2019, mainly talking about cosmology, quantum mechanics, black holes and the value of our civilisation.
The Earth, with everyone else
10 yrs, 1 mo on Twitter
2,845,678 49.1%
24.profile imageProf. Karen Masters 💫⭐️✨

Professor of astrophysics @haverfordedu. Investigating galaxies with @GalaxyZoo @SDSSurveys. Touch a galaxy @TactileUniverse. Mostly tweeting astronomy. British
Ardmore, PA
9 yrs, 10 mos on Twitter
7,752 49.1%
25.profile imageDr./Prof. Renée Hložek

South African cisgender, bisexual woman Assistant Prof. of Astrophysics, Rhodes scholar (and lover of loud karaoke), Senior TED Fellow. Feminist scientist.
Toronto, Ontario
9 yrs, 5 mos on Twitter
5,433 48.8%
26.profile imageESA

European Space Agency, keeping you posted on European space activities.
9 yrs, 10 mos on Twitter
915,580 48.3%
27.profile image★ dr amanda bauer ★

Head of Education & Public Outreach for LSST. Music creator. Co-host of #CosmicVertigo space podcast abc.net.au/radionational/…
Tucson, AZ
10 yrs, 10 mos on Twitter
9,652 48.3%
28.profile imageNASA JPL

NASA Jet Propulsion Laboratory manages many of NASA's robotic missions exploring Earth, the solar system and our universe. Tweets from JPL's News Office.
Pasadena, Calif.
9 yrs, 11 mos on Twitter
2,745,436 47.7%
29.profile imageSean Carroll

Physicist at Caltech. Author of The Big Picture and other books. Host of #MindscapePodcast. Married to @JenLucPiquant. In favor of truth and kindness.
Los Angeles
9 yrs, 10 mos on Twitter
226,956 47.7%
30.profile imageMolly Peeples

Astronomer in the Science Policies Group @STScI playing with galaxies & gas, real & fake. #Hubble, #JWST, #WFIRST pay the bills; opinions are my own. She/her.
Baltimore, MD, z=0
6 yrs, 3 mos on Twitter
7,498 47.5%
31.profile imageMike Brown

Astronomer, planet hunter, Pluto killer, bear whisperer, Finger-wrapped dad. Dangerous secularist.
How I Killed Pluto and Why It Had...
Pasadena, CA
9 yrs, 9 mos on Twitter
63,443 46.9%
32.profile imageAlex Parker

Planetary astronomer and artist exploring the origin and history of our solar system. Director of @ESPRESSO_SSERVI. If in doubt, I could probably laser it.
Boulder, Colorado
10 yrs, 0 mos on Twitter
28,110 46.9%
33.profile imageKelle Cruz

Astronomy Prof at @Hunter_College, @AMNH, and #BDNYC. Liveable streets. @Spurs. Founder, editor of @AstroBetter & CEO of @ScienceBetter. Coordinator of @Astropy
New York, NY
9 yrs, 11 mos on Twitter
4,965 46.9%
34.profile imageFraser Cain

Publisher of universetoday.com, co-host of astronomycast.com. Named after Asteroid 158092.
Courtenay, British Columbia
11 yrs, 10 mos on Twitter
39,491 46.6%
35.profile imageMeg Urry

Yale physics prof, likes supermassive black holes, teaching, writing, increasing participation in STEM, my family
Yale University
7 yrs, 2 mos on Twitter
4,332 45.6%
36.profile imageMC Stardust ✨ Inclusion Rider 4 Life

Astrophysicist by day and all around rock-it scientist whenever I get my act together. Tweets are my own opinions. Intersectional or GTFO. 1/2 of @startorialist
Moon/New York City
8 yrs, 9 mos on Twitter
12,634 45.3%
37.profile imageDr. Jessie Christiansen

NASA Research Scientist | #exoplaneteer | #WomenInStem advocate | Science curator at @NASAExoArchive | Usual nerd grab-bag of fandoms | She/her
Caltech, Pasadena, CA, USA
5 yrs, 0 mos on Twitter
7,710 45.3%
38.profile imageAlyssa A. Goodman

Astronomy Professor at Harvard, CoDirector of Science at Radcliffe Institute. Loves data, visualization, Universe, education, people. Not in that order.
9 yrs, 11 mos on Twitter
3,678 45.0%
39.profile imageProf. Emily Rice, Ph.D.

Astronomer at @csinews, @GC_CUNY, @AMNH, #BDNYC, & #CUNYAstro; @AstronomyOnTap organizer, 1/2 of @startorialist, & @knitted_bd host ⭐️. Not @djcarlysagan 😜
Occupied Lunaape Land (NYC)
11 yrs, 4 mos on Twitter
5,155 44.8%
40.profile imageBrooke Simmons

Distracted astrophysicist researching galaxies & black holes; on @galaxyzoo & @the_zooniverse teams. Also planetaryresponsenetwork.org lead. (She/her)
San Diego, CA
10 yrs, 4 mos on Twitter
6,163 44.5%
41.profile imageBrian Schmidt

An overly busy Cosmologist who is Vice Chancellor of the ANU, Wine maker, Dad & Husband. 2011 Nobel Laureate in Physics
Canberra Australia
9 yrs, 1 mo on Twitter
23,585 44.0%
42.profile imageMichele Bannister

Planetary astronomer, poet, hunter of new and strange worlds. Connoisseur of fuzzy dots of light. Asteroid (10463). Postdoctoral Research Fellow @AstroQUB.
living the life non-sidereal
9 yrs, 10 mos on Twitter
7,900 43.7%
43.profile imageElon Musk

9 yrs, 7 mos on Twitter
24,195,416 43.4%
44.profile imageProf. Abel Méndez

Planetary Astrobiologist and Director of the @PlanetaryHabLab. Looking at habitable worlds from the Arecibo Observatory. #exoplanets #astrobiology #habitability
Searching for Habitable Worlds
Arecibo, Puerto Rico
9 yrs, 2 mos on Twitter
14,273 43.4%
45.profile imageCatherine Q.

Astrophysicist, science communicator, over-thinker. One of @HuffPostscience Top 30 Physicists to follow. Autoimmune illness girl. Nomadic Kiwi. Dogs rule.
New Zealand
9 yrs, 10 mos on Twitter
40,876 43.2%
46.profile imageAlessondra Springmann

asteroids, comets, sounding rockets, @AreciboRadar/🇵🇷 love, cacti, geology, autoimmune disease, puns, cat herding, rants, 小惑星レーダー天文学者, she/her
Chukson / Tucson, AZ
8 yrs, 8 mos on Twitter
7,575 43.2%
47.profile imageNASA Kepler and K2

Launched in March 2009, Kepler is NASA's first spacecraft to detect Earth-size planets in the just-right Goldilocks habitable zone of other stars.
Trailing Earth around the Sun
10 yrs, 1 mo on Twitter
623,419 42.9%
48.profile imageESO

The European Southern Observatory is the most productive observatory in the world. We design, build & operate some of the most advanced telescopes in the world.
Garching, Germany
10 yrs, 5 mos on Twitter
80,098 42.6%
49.profile imageDr Pamela L Gay

Communicating astronomy & life 1 sidereal day at a time. All opinions & ideas are my own. Support my on Patreon.com/starstryder or paypal.me/starstryder.
Edwardsville, IL
10 yrs, 11 mos on Twitter
39,309 42.6%
50.profile imageSarcasticRover

Doing a science on the red planet. Not @MarsCuriosity. Portrait by @badportraits. Written by @jfiliatrault.
4th Rock From the Sun
6 yrs, 5 mos on Twitter
979,627 41.8%
51.profile imageNASA Webb Telescope

NASA's James Webb Space Telescope will give us an amazing look at the universe! It will launch in 2021. RT, likes, and/or @mentions do not imply endorsement.
Greenbelt, Maryland
9 yrs, 9 mos on Twitter
396,205 41.8%
52.profile imageDr Rachael Livermore

Astrophysicist | Science Communicator. Videos of my public talks at bit.ly/SciTalks
London, England
10 yrs, 6 mos on Twitter
6,073 41.8%
53.profile imageDr. Tanya Harrison

🇨🇦 Professional Martian 🛰 Director of Research @asunewspace 💫 Web Editor @exploreplanets 🔴 Current/former ops team @[email protected]+MRO
Toronto / Phoenix
9 yrs, 10 mos on Twitter
23,258 41.6%
54.profile imageProf. Nicole Gugliucci, Doctor of the Sky

Professor, astronomer, education researcher, science communicator, advocate for equity in STEM. Geek, crossfitter, dog mom. She/her. 💙💜💖 Tweets my own, etc
New Hampshire, USA
10 yrs, 7 mos on Twitter
20,856 41.6%
55.profile imageCassiniSaturn

Our spacecraft is gone, but the science continues. Join us at @NASASolarSystem for the latest.
Saturn, Solar System
10 yrs, 6 mos on Twitter
1,637,289 41.3%
56.profile imageNewHorizons2015

The First Space Mission to Explore Planet Pluto--Ride Along Via Principal Investigator Alan Stern's Private New Horizons Twitter Feed. Follow Stern @AlanStern
Deeeeep Space
10 yrs, 5 mos on Twitter
291,006 41.3%
57.profile imageDavid Spergel

Astrophysicist at Princeton University and Flatiron Institute
Princeton NJ
5 yrs, 0 mos on Twitter
5,180 40.8%
58.profile imagePeter Edmonds

Work in astronomy publicity after surviving an astrophysics PhD & postdocs. Interested in science & scicomm. Opinions are mine & RTs aren't always endorsements.
7 yrs, 0 mos on Twitter
4,090 40.8%
59.profile imageChanda Prescod-Weinstein 🙅🏽‍♀️ 🇧🇧🌈

#BlackandSTEM Prof of Particle Physics&Cosmology, feminist #STS/#HistSTM. agender cissex woman, tweets by/for me only. #DisorderedCosmos coming @BoldTypeBooks!
10 yrs, 7 mos on Twitter
45,537 40.5%
60.profile imageDr JJ Eldridge

NZ theoretical astrophysicist studying exploding binary stars. Lecturer, Speaker, Sci-fi addict, feminist, non-binary trans empress. Pronouns: them/they/she
The Lives and Death-Throes of Mas...
Auckland, New Zealand
5 yrs, 8 mos on Twitter
4,299 40.5%
61.profile imageNASA's Juno Mission

Exploring Jupiter to improve our understanding of the planet's origins and the formation of planetary systems. missionjuno.org nasa.gov/juno
9 yrs, 11 mos on Twitter
732,667 40.2%
62.profile imageNASA New Horizons

The New Horizons spacecraft flew past the dwarf planet Pluto and its moons in July 2015. Next up is a New Year's 2019 flyby of Kuiper Belt object Ultima Thule.
Solar System
4 yrs, 5 mos on Twitter
385,137 40.2%
63.profile imageSarah Ballard

Habitable worlds, kindness, fiction, etc. At ~75 km/s*Mpc! One half of @drssarahcare
Cambridge, MA
4 yrs, 11 mos on Twitter
3,252 40.2%
64.profile imageESA Rosetta Mission

ESA spacecraft that studied Comet 67P/Churyumov-Gerasimenko & sent @philae2014 to its surface. Mission completed 30 Sep 2016. Follow @esascience for latest news
5 yrs, 7 mos on Twitter until last tweet (2016-Sep-30)
475,217 39.7%
65.profile imageMeg Schwamb

Planetary scientist, astronomer, Gemini North assistant scientist: KBOs, Planet Four(Mars), MBCs(Comet Hunters),LSST SSSC co-chair. Opinions tweeted are my own
Hilo, HI
8 yrs, 8 mos on Twitter
4,541 39.7%
66.profile imageDavid Charbonneau

Exoplaneteer and Professor of Astronomy at Harvard. Girl Scout leader, hockey coach, and proud father of four daughters and future presidents.
Harvard University
5 yrs, 0 mos on Twitter
3,211 39.7%
67.profile imageJohn Asher Johnson

Sayer of words, typist of things, one who professes professionally, figurer of things out, player of basketball, abuser of language. Views expressed r mine
How Do You Find an Exoplanet? (Pr...
Cambridge, MA
5 yrs, 11 mos on Twitter
2,329 39.7%
68.profile imageChris Hadfield

Canadian Astronaut, back on Earth after 3 spaceflights. For events and media, please write to [email protected]
8 yrs, 4 mos on Twitter
2,396,322 39.4%
69.profile imageESA Science

Science @ the European Space Agency ESA, keeping you posted on European space science activities.
Noordwijk, The Netherlands
9 yrs, 0 mos on Twitter
303,200 39.4%
70.profile imageBenneHolwerda

Astronomer at large (mostly harmless). University of Louisville. Opinions & typos obv my own.
Louisville, KY
10 yrs, 6 mos on Twitter
1,866 39.4%
71.profile imagePlanetary Society

Citizen-powered #space exploration led by CEO @BillNye. Join us.
Pasadena, CA
8 yrs, 3 mos on Twitter
188,224 39.1%
72.profile imageHubble

The official Twitter account for the NASA Hubble Space Telescope, managed and operated by NASA's Goddard Space Flight Center.
Goddard Space Flight Center
10 yrs, 10 mos on Twitter
6,074,030 38.3%
73.profile imageBill Nye

9 yrs, 8 mos on Twitter
5,790,520 38.3%
74.profile imageThe SETI Institute

We believe we are conducting the most profound search in human history — to know our beginnings and our place among the stars.
Mountain View, CA
9 yrs, 8 mos on Twitter
680,382 38.1%
75.profile imageNature News & Comment

Science news & opinion from the news team at Nature, the international journal of #science. Get our daily newsletter: go.nature.com/naturebriefing
10 yrs, 5 mos on Twitter
1,887,731 37.8%
76.profile imageRisa Wechsler

astrophysicist. cosmologist. maker of universes and various kinds of trouble. professor of physics @stanford and director of @kipac1
San Francisco
6 yrs, 4 mos on Twitter
4,327 37.8%
77.profile imageNadia Drake

Contributing writer @natgeo. Former ballet dancer. Slightly obsessed with planets (and MOONS), supernovas and spiders. Champagneophile.
8 yrs, 3 mos on Twitter
25,736 37.5%
78.profile imageJedidah Isler, PhD

Astrophysicist / Professor / Relentless Dreamer / Innovator / Founder & Host @VanguardSTEM / Senior @TEDFellow / @NatGeo Explorer
8 yrs, 5 mos on Twitter
13,871 37.5%
79.profile imageAlberto Conti

Astrophysicist & Director of New Business at Ball Aerospace - Tweets are my own, at least in this multiverse. en.wikipedia.org/wiki/Alberto_C…
Colorado, USA
10 yrs, 6 mos on Twitter
3,518 37.5%
80.profile imageDr Chiara Mingarelli

Gravitational-wave astrophysicist. Flatiron Research Fellow at @FlatironCCA. Previously @Caltech, @NASAJPL, and MPIfR. Views my own.
New York, NY
7 yrs, 10 mos on Twitter
6,264 37.3%
81.profile imageMika McKinnon

Field geophysicist, disaster researcher, scifi science consultant, science writer, public speaker, irrepressibly curious.
West Coast
9 yrs, 7 mos on Twitter
30,927 37.0%
82.profile imageMatthew R Francis

Writer of physics and astronomy. Wearer of jaunty hats. Tryin' to publish a novel. Proud Rebel scum. Avatar by @ScienceComic . He/him.
Cleveland, OH
8 yrs, 4 mos on Twitter
17,340 37.0%
83.profile imagePhilae Lander

On 12 November 2014 I landed on comet #67P as part of @ESA_Rosetta. I am operated by @DLR_en's Lander Control Center LCC in Cologne.
Interplanetary Space
8 yrs, 2 mos on Twitter
398,705 36.7%
84.profile imageShit Academics Say

A social experiment | @prof_nch
5 yrs, 3 mos on Twitter
301,766 36.7%
85.profile imageAlexandra Witze

Correspondent for Nature, views my own. Reach me (generally) witzescience-at-gmaildotcom or (securely) awitze-at-protonmaildotcom.
Boulder, CO
9 yrs, 10 mos on Twitter
19,787 36.7%
86.profile imageNature Astronomy

A Nature journal dedicated to presenting the very best research across the disciplines of astronomy, astrophysics, cosmology and planetary science.📡
London, England
3 yrs, 3 mos on Twitter
16,795 36.7%
87.profile imageSTARtorialist

Where science meets fashion and scientists get FABULOUS! Blog & pop-up shop by professional astronomers @Summer_Ash & @emilylurice. Goal for 2019: online shop!
The Universe
5 yrs, 1 mo on Twitter
4,187 36.7%
88.profile imageDr. Christina Richey

Planetary Scientist/Astrophysicist, fighter 4 inclusion in STEM, love/hate relationship w/ workouts, wine drinker, making my mom 😊; views are my own. they/them
Los Angeles, CA
3 yrs, 4 mos on Twitter
2,425 36.7%
89.profile imageAnna Frebel

Astronomer & stellar archaeologist searching for the oldest stars in the universe (yes, they are 12-13 billion yrs old!); also professor at MIT & author
Searching for the Oldest Stars
New Horizons in Astronomy
Cambridge, MA, USA
5 yrs, 7 mos on Twitter
12,924 36.2%
90.profile imageDr Anna Watts

Associate Professor of Astrophysics @ Univ. of Amsterdam. Neutron stars (explosions, dense matter), X-ray astronomy. Mom, Migrant. Particles in stars blah blah.
4 yrs, 7 mos on Twitter
3,646 35.9%
91.profile imageKarin Sandstrom

Assistant professor of astronomy and physics. Lover of coffee, interstellar dust, California, nerdy stuff. Originally from SW Washington.
San Diego, CA
9 yrs, 9 mos on Twitter
2,657 35.9%
92.profile imageGrant Tremblay

Astrophysicist at the Center for Astrophysics | Harvard & Smithsonian. Previously @NASA Einstein Fellow @Yale, Fellow @ESO, & SDAS regular @STScI. Views my own.
Cambridge, MA
9 yrs, 10 mos on Twitter
2,541 35.9%
93.profile imageEd Yong

Science writer at The Atlantic. Author of I CONTAIN MULTITUDES, a New York Times bestseller on animal-microbe partnerships. edyong.me
Washington, DC
9 yrs, 11 mos on Twitter
151,141 35.7%
94.profile imageSophia Gad-Nasr 🏳️‍🌈

Astroparticle physicist working on dark matter. PhD student @UCIrvine. Feminist. Captivating the world w/ physics, one particle at a time. And w/ hamsters.
🐶|Los Angeles〉+ 🐹|Irvine〉
8 yrs, 8 mos on Twitter
21,066 35.4%
95.profile imageUniverse Today

Universe Today - universetoday.com, a website about space and astronomy. Tweets are probably coming from @fcain
Courtenay, British Columbia
9 yrs, 10 mos on Twitter
286,897 35.1%
96.profile imageLucy/ @RealScientists

Real science from real scientists, writers, communicators, artists & clinicians. This week: LUCY SMITH| Stem Cells Research | @Lucy_Smith_13
5 yrs, 11 mos on Twitter
70,507 34.9%
97.profile imageDr Jane MacArthur

Planetary scientist @UniOfLeicester studying martian meteorites & comet dust. Writer @PopAstro. Fellow @RoyalAstroSoc #RAS200 #Violinist
9 yrs, 11 mos on Twitter
7,198 34.9%
98.profile imageJane Rigby

Astronomer @nasa studying black holes & galaxies w/ telescopes around world & in space, helping build @NASAWebb. Queer parent scientist UU activist. Views mine.
DC Metro
8 yrs, 0 mos on Twitter
4,848 34.9%
99.profile imageGeert Barentsen

NASA Astronomer in Silicon Valley. Leads the wonderful @KeplerGO team at @NASAAmes. Belgian (like waffles). #KeplerMission #K2Mission
Mountain View, CA
9 yrs, 7 mos on Twitter
3,208 34.9%
100.profile imageThomas Robitaille

Freelance, software developer, lead developer of Glue, co-ordinator for the Astropy project, software Editor for AAS Publishing, open development advocate.
United Kingdom
9 yrs, 9 mos on Twitter
2,294 34.9%
101.profile imageJosh Peek

Principal Investigator @MAST_News. Data Science and astronomy at @stsci and JHU. Statements do not reflect the position of any employer, obvi.
9 yrs, 11 mos on Twitter
1,265 34.9%
102.profile imageNASA Goddard

Tweeting the best in astrophysics, Earth sciences, engineering, robotic exploration, Sun science, and technology for NASA's Goddard Space Flight Center.
Greenbelt, MD USA
9 yrs, 11 mos on Twitter
505,375 34.6%
103.profile imageRobert McNees

Professor, physicist, sci comm. Black holes, quantum gravity, cosmology. Tar Heel. RT = spooky action at a distance. Opinions are mine alone.
Chicago, z=0
10 yrs, 7 mos on Twitter
12,807 34.6%
104.profile imageKevin Schawinski

Co-founder/CEO @modulos_ai
Zurich, Switzerland
7 yrs, 11 mos on Twitter
4,532 34.6%
105.profile imageProf. Lisa Harvey-Smith

Astrophysicist, Australia’s Women in STEM Ambassador, Author #WhenGalaxiesCollide, TEDx Speaker, Presenter, @ABCTV Stargazing Live.
7 yrs, 2 mos on Twitter
16,065 34.3%
106.profile imageDr. Jennifer L. Hoffman ✨

Astronomer, associate professor, alto, auntie, ailurophile. University of Denver
Stellar Polimetry
Denver, CO
5 yrs, 0 mos on Twitter
2,781 34.3%
107.profile imageDr Michelle Collins

Astrophysicist working on Local Group galaxies. Soft spot for Andromeda. Keen runner. All views my own. RT != endorsement
Guildford, England
9 yrs, 8 mos on Twitter
1,717 34.0%
108.profile imageAlan Stern

Scientist. Space Explorer. Author. Speaker, Optimist. Pilot. Dad. Not necessarily in that order. Follow my New Horizons Twitter feed @NewHorizons2015.
Chasing New Horizons
Pluto and Charon
Worlds Beyond
Niwot, CO
10 yrs, 5 mos on Twitter
35,990 33.8%
109.profile imageESA Gaia

Science with 1 billion objects in three dimensions
9 yrs, 10 mos on Twitter
20,060 33.8%
110.profile imageLee Billings

Science journalist covering space and physics for @sciam. Author of Five Billion Years of Solitude, a book on the search for alien Earths. Opinions are my own.
New York City
9 yrs, 8 mos on Twitter
8,128 33.8%
111.profile imageDavid Grinspoon

Astrobiologist, Author, Musician. New book CHASING NEW HORIZONS: Inside the Epic First Mission to Pluto.
Chasing New Horizons
Earth in Human Hands
Towards Understanding the Climate...
Biosphere One
7 yrs, 3 mos on Twitter
22,967 33.5%
112.profile imagePeter Coles 🌈 🇪🇺 🇮🇪

Theoretical astrophysicist specialising in the Universe and all that surrounds it. Also into jazz, opera, poetry & crosswords. Beard of the Year 2018. #FBPE
The Routledge Companion to the Ne...
From Cosmos to Chaos
Maynooth, Co Kildare, Ireland
9 yrs, 3 mos on Twitter
5,773 33.5%
113.profile imageDan F-M

I write code for good & astrophysics.
7 yrs, 5 mos on Twitter
2,626 33.5%
114.profile imageRoyal Astronomical Society

The RAS is a learned society representing astronomers and geophysicists in the UK & worldwide. Tweets by @RobertMMassey, @MorganDJHollis, & @DrHelenKlus.
Burlington House, London
8 yrs, 10 mos on Twitter
28,631 33.2%
115.profile imageAlan Duffy

A/Professor in Astrophysics at @Swinburne and Lead Scientist of @RiAus Instagram.com/profalanduffy
6 yrs, 6 mos on Twitter
20,086 33.2%
116.profile imageJason Wright

Associate Professor of Astronomy and Astrophysics at Penn State. Son, husband, father, scientist, teacher, student, human. Mostly posting astronomy.
State College, PA, USA
6 yrs, 3 mos on Twitter
5,967 33.2%
117.profile imageCarolyn Porco

Cassini imaging lead. Visiting Scholar UC Berkeley. National Geographic Eliza Scidmore awardee. I think. I speak. I write. Opinions are my own.
9 yrs, 5 mos on Twitter
62,336 33.0%
118.profile imageMarc Kuchner

PI of Citizen Science projects backyardworlds.org, diskdetective.org, Astrophysicist, Songwriter.
Marketing for Scientists
Greenbelt, MD
10 yrs, 1 mo on Twitter
5,739 33.0%
119.profile imageMeredith Rawls

Stellar astronomer and data management for @LSST. Also: mom, scicommer, violist, Episcopalian. Less nighttime blue light, more 24/7 equity. Keep looking up.
Seattle, WA
8 yrs, 10 mos on Twitter
5,050 33.0%
120.profile imageDr. Phil Metzger

Planetary scientist at @UCF. CoFounder NASA KSC SwampWorks. Space Mining. Space Settlement. Science.
Orlando, FL
6 yrs, 1 mo on Twitter
72,330 32.7%
121.profile imageAstro Union

Founded in 1919, the International Astronomical Union (IAU) promotes and safeguards the science of astronomy through international cooperation.
4 yrs, 7 mos on Twitter
6,973 32.7%
122.profile imageElisabeth Newton

NSF postdoc and stellar physicist @MIT with a passion for education and #scicomm. Also a climber, baker, crafter & @astrobites co-founder.
Cambridge, MA.
7 yrs, 7 mos on Twitter
2,208 32.7%
123.profile imageNew Scientist

The best place to find out what’s new in science – and why it matters. To subscribe go to: https://t.co/M4DdnmRv4N
9 yrs, 11 mos on Twitter
3,407,595 32.4%
124.profile imageAmber Straughn

Arkansas native & @NASA astrophysicist. Climate change is real. Pilot, yogini, homebrewer, Great Dane mom, @PearlJam fan, Razorback 🏈 fan, #FirstGen Tweets mine
7 yrs, 8 mos on Twitter
13,461 32.4%
125.profile imageJessica Kirkpatrick

Jessica Ann Kirkpatrick, Astrophysicist → Data Scientist #scientist #techie #runner #feminist #writer #catmom #dogstepmom
San Francisco, CA
9 yrs, 6 mos on Twitter
4,970 32.4%
126.profile imageDavid Kipping

Exoplanets & Exomoons, Columbia University, Cool Worlds Lab. RTs ≠ endorsements
The Transits of Extrasolar Planet...
Manhattan, NY
9 yrs, 10 mos on Twitter
3,658 32.4%
127.profile imageEmily Levesque ✨🔭

Astronomer, author, bizarre star enthusiast, telescope story collector. || The real exciting sound in science is not "Eureka!", it's "huh, that's weird..."
Understanding Stellar Evolution
Astrophysics of Red Supergiants
Seattle, WA
8 yrs, 11 mos on Twitter
2,542 32.4%
128.profile imageAdam Burgasser

astrophysicist, professor, and preferably in the water.
on a plane, or San Diego
8 yrs, 5 mos on Twitter
1,857 32.4%
129.profile imageEthan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, author, Forbes & NASA columnist.
Beyond the Galaxy
Portland, OR
7 yrs, 9 mos on Twitter
13,020 32.2%
130.profile imageJackie Faherty

Astrophysicist at @AMNH. Enthusiast for bringing the cosmos to the public @backyardworlds #womeninscience #BDNYC #manhattanhenge calculator. #scicomm
9 yrs, 10 mos on Twitter
4,498 32.2%
131.profile imageJohanna

Astronomer, runner, educator, feminist, vegan, #Nats fan, she/her/hers
Pasadena, CA
5 yrs, 0 mos on Twitter
2,189 32.2%
132.profile imageCERN

#CERN, the European Organization for Nuclear Research, is the world's largest particle physics lab, home of the #LHC. French: @CERN_FR
10 yrs, 6 mos on Twitter
2,556,228 31.9%
133.profile imageRobert Simpson

Googler, astronomer, TED Fellow. Views are my own.
11 yrs, 9 mos on Twitter
31,372 31.9%
134.profile imageHaley Gomez

I'm an Astrophysicist, love books, films astronomy, shoes and dresses.
9 yrs, 1 mo on Twitter
3,011 31.9%
135.profile imageJames Davenport

Astronomy PhD, [v/b]logger, casual data analyst, Seattleite. All opinions are my own.
6 yrs, 8 mos on Twitter
2,342 31.9%
136.profile imageCaitlin Casey

Astronomer and Assistant Professor at the University of Texas at Austin.
Austin, TX
4 yrs, 11 mos on Twitter
2,045 31.9%
137.profile imageLIGO

Official Twitter of the LIGO Scientific Collaboration. We detect gravitational waves! YouTube: youtube.com/ligovirgo
Livingston, LA and Hanford, WA
10 yrs, 7 mos on Twitter
83,582 31.6%
138.profile imageProf. Lucie Green

Royal Society University Research Fellow, Professor of Physics at UCL. Staring at the Sun & beyond. Chief Stargazer @popastro. 1st book: amzn.to/2nitfmi
8 yrs, 7 mos on Twitter
20,062 31.6%
139.profile imageEmily Petroff

Astronomer. Reader. Random number generator. I study things that go bang. 📡💥 Veni Fellow studying fast radio bursts at the University of Amsterdam in the API.
The Netherlands
5 yrs, 6 mos on Twitter
5,137 31.6%
140.profile imageBecky Smethurst

Astrophysicist researching how black holes affect galaxies. I make space and science videos on YouTube. Enthusiasm reigns here! youtube.com/drbecky
Oxford, England
9 yrs, 9 mos on Twitter
3,326 31.6%
141.profile imageBobak Ferdowsi

Explorer of space. Engineer on NISAR Earth Science & Europa Clipper. Mars Curiosity, Cassini Saturn. Cat dad. Self-opinioned.
Pasadena, CA
9 yrs, 5 mos on Twitter
121,531 31.4%
142.profile imageDr Erin Ryan

Doctor of the flying space rocks, prez of Science on Cake Appreciation Society, collector of orchid plants & stress baker. Not tweeting for any employer.
The shores of the crab infested impact crater
9 yrs, 4 mos on Twitter
2,799 31.4%
143.profile imageCorey S. Powell

Science writer on @BillNyeSaves. Contributing editor at @discovermag, @AmSciMag, and @aeonmag. Science-curious.
Brooklyn, NY
9 yrs, 10 mos on Twitter
66,656 31.1%
144.profile imageNatalie Batalha

Eukaryote on planet Earth using self-awareness and empathy to experience love and seek knowledge. Astronomer involved in search for life on exoplanets.
Silicon Valley, California
9 yrs, 11 mos on Twitter
5,997 31.1%
145.profile imageJesse Shanahan

Data scientist at Booz Allen. Astrophysicist. Volunteer EMT & USAR hopeful. Cofounded @AAS_WGAD, creator of #disabledandSTEM. Wants accessible video games! #EDS
Stolen Manahoac Land
7 yrs, 7 mos on Twitter
5,196 31.1%
146.profile imageSloan Digital Sky Surveys

Tweeting about mapping the Universe @APOGEEsurvey @eBOSSurvey @MaNGASurvey
Apache Point Observatory.
5 yrs, 11 mos on Twitter
4,001 31.1%
147.profile imageRuth Angus

Assistant Curator of Astrophysics at the American Museum of Natural History @AMNH, Assoc Research Scientist @FlatironCCA & Adj Prof at Columbia University.
New York, NY
7 yrs, 8 mos on Twitter
1,614 31.1%
148.profile imageTim Peake

ESA astronaut & test pilot back on Earth after 6 months in space. New book out now (proceeds to Prince's Trust): amzn.to/2MLUsJK Tweets are my own
Cologne, Germany
6 yrs, 9 mos on Twitter
1,623,932 30.8%
149.profile imageNYT Science

Science, Medicine, Environment, Space and Cosmos. Sync your calendar with the solar system: nyti.ms/2ECMtej
New York, NY
11 yrs, 10 mos on Twitter
1,139,674 30.8%
150.profile imageRogue NASA

The unofficial "Resistance" team of NASA. Not an official NASA account. Not managed by gov't employees. Come for the facts, stay for the snark.
Washington, DC
1 yr, 11 mos on Twitter
867,413 30.8%
151.profile imageJason Major

Space. Planets. NASA. Science. Rocketry. Astronomy. Democracy. Nature. Birds. Coffee. Occasionally funny. Bad with numbers. Sometimes I make pictures.
Warwick, RI
9 yrs, 0 mos on Twitter
28,860 30.8%
152.profile imageThe Zooniverse

The world's largest and most successful citizen science organisation. Our projects include Galaxy Zoo, Old Weather, Planet Hunters, Snapshot Serengeti & more.
Zooniverse HQ
9 yrs, 2 mos on Twitter
19,665 30.8%
153.profile imageStuart

Maker of things. Data wrangler. Co-author of "Cosmos: The Infographic Book of Space". Podcaster. Has ridden across continents on a bicycle. ✨🛰📕📊🏳️‍🌈
11 yrs, 7 mos on Twitter
8,106 30.8%
154.profile imageJames Bullock

Astronomer. Cosmologist. Befuddled dad. Professor at #UCIrvine. Chair of @UCIPhysAstro Sometimes mumbler on @ScienceChannel #HTUW
Irvine, California, USA
9 yrs, 5 mos on Twitter
3,474 30.8%
155.profile imageScientific American

Awesome discoveries. Expert insights. Science that shapes the world.
New York City
10 yrs, 8 mos on Twitter
3,686,828 30.6%
156.profile imageBuzz Aldrin

88 yrs young. Gemini 12 & Apollo 11 Astronaut & Moonwalker; West Point to USAF Colonel, Korean War veteran; Doctorate, MIT Founder, Human SpaceFlight Institute
9 yrs, 7 mos on Twitter
1,357,538 30.6%
157.profile image.Astronomy

Conference series about what happens when hackers, astronomers and the web all get together.
Cambridge, MA, USA
10 yrs, 7 mos on Twitter
3,929 30.6%
158.profile imageScience Magazine

The world's leading outlet for cutting-edge research in all areas of science. Follow @NewsfromScience for stories from our news team.
Washington, DC & Cambridge, UK
9 yrs, 9 mos on Twitter
1,224,779 30.3%
159.profile imageNASA InSight

The InSight mission will study the early evolution of terrestrial planets. Launched May 5, 2018. Landed Nov. 26, 2018.
Elysium Planitia, Mars
7 yrs, 2 mos on Twitter
686,634 30.3%
160.profile imageJames Tuttle Keane

Postdoc at @Caltech. Studying planetary geophysics of rocky & icy worlds. Occasional science illustrator. Trekkie. Dog dad. He/him.
Pasadena, CA
4 yrs, 9 mos on Twitter
5,581 30.3%
161.profile imageKatey Alatalo

Ph.D. astronomer at STScI, currently housed at Carnegie. Space is amazing! My views are my own.
Pasadena, CA
10 yrs, 7 mos on Twitter
3,530 30.3%
162.profile imageESA Operations

From Earth orbit to deep space: sharing the excitement of realtime mission operations at the European Space Agency #WhereMissionsComeAlive 🛰🕹️
Darmstadt, Germany
10 yrs, 2 mos on Twitter
260,542 30.0%
163.profile imageNASA's Dawn Mission

My mission has ended, but the science continues. Visit @NASASolarSystem for the latest.
Main Asteroid Belt
9 yrs, 2 mos on Twitter
234,504 30.0%
164.profile imageIan O'Neill

Recovering solar astrophysicist, science writer/editor, skeptic, hairy atheist, fairly liberal, rabbit fan.
Woodland Hills, Los Angeles
10 yrs, 5 mos on Twitter
35,938 30.0%
165.profile imageFranck Marchis

Planetary astronomer at the SETI Institute, CSO at Unistellar, husband, dad & crossfit athlete balancing his life. Tweet about space, our planet & human rights.
San Francisco
8 yrs, 4 mos on Twitter
6,180 30.0%
166.profile imageJason Kalirai

Astrophysicist and Civil Space Mission Area Executive @JHUAPL. Excited about space exploration and enabling new science with amazing missions. Tweets mine.
Highland, MD
7 yrs, 6 mos on Twitter
2,422 30.0%
167.profile imagePHD Comics

Life (or the lack thereof) in Academia. Instagram.com/phd_comics
10 yrs, 5 mos on Twitter
220,935 29.8%
168.profile imageBrian Keating

Physics Professor: @UCSanDiego @UCSDcosmology. Dir.: @SimonsObs. Assoc. Dir.: @imagineUCSD. Author LOSING THE NOBEL PRIZE amzn.to/2sa5UpA @WWNorton @TantorAudio
San Diego, CA
8 yrs, 3 mos on Twitter
7,061 29.8%
169.profile imageWomanAstro

Promoting astronomy, encouraging women/girls interested in science. WomanAstro.com, etsy.com/shop/WomanAstro
New Mexico, USA
9 yrs, 1 mo on Twitter
4,962 29.8%
170.profile imageOverheard On Astroph

Eavesdropping on tex-source comments in papers posted to astro-ph
9 mos on Twitter until last tweet (2014-Oct-21)
2,274 29.8%
171.profile imagePhil Marshall

Astrophysicist, into cosmology, gravitational lenses and inference. This is the closest thing I have to a research blog. I'll write more if you tweet at me.
San Francisco
9 yrs, 8 mos on Twitter
1,523 29.8%
172.profile imageBlackPhysicists

Arlington, VA and Worldwide
9 yrs, 7 mos on Twitter
19,010 29.5%
173.profile imageTrueSciPhi

A window on science, mathematics, and philosophy communities on Twitter and YouTube, by Kelly Truelove. See site for more.
Austin, Texas
3 yrs, 7 mos on Twitter
5,963 29.5%
174.profile imageScience Friday

Brain fun for curious people. Hosted by @iraflatow. From @WNYCStudios.
New York, New York
10 yrs, 3 mos on Twitter
761,413 29.2%
175.profile imageSPACE.com

News coverage and conversation about space science, astronomy and exploration. Part of @futureplc
10 yrs, 6 mos on Twitter
751,615 29.2%
176.profile imageHUBBLE

The official feed of ESA/Hubble. The Hubble Space Telescope is the space-based observatory which has revolutionised modern astronomy.
8 yrs, 8 mos on Twitter
566,320 29.2%
177.profile imageHannah Wakeford

Giacconi Fellow @STScI/@AURADC , @exo_cast podcaster & @BSACDIVER | Previously @NASAGoddard Fellow & @UniofExeter PhD | Expressed opinions are mine
7 yrs, 3 mos on Twitter
2,338 29.2%
178.profile imageDr. Rachael Beaton

migrant astronomer currently at Princeton; 'i have loved the stars too fondly to be fearful of the night' - sarah williams
princeton, nj
8 yrs, 10 mos on Twitter
1,322 29.2%
179.profile imageJC Holbrook

Astrophysicist, Filmmaker, Cultural Astronomer. Hubble's Diverse Universe on Amazon.com BlackSunMovie.com videos.astroanthro.com/Science-Tourist
Kaapstad, ZA
9 yrs, 5 mos on Twitter
2,722 29.0%
180.profile imageSpirit and Oppy

Roving the Red Planet on six wheels since Jan 2004. The official mission Twitter of the Spirit and Opportunity rovers.
Mars: Gusev Crater & Meridiani
10 yrs, 6 mos on Twitter
462,738 28.7%
181.profile imageDNLee

#JrProf, Mammalogist, Diversity & Access to STEM, Unapologetically Intersectional, Mama Panyabuku, TED Fellow, NatGeo Emerging Explorer, #DispatchesDNLee
Midwest, US; Tanzania, Africa
8 yrs, 5 mos on Twitter
29,527 28.7%
182.profile imageShannon Stirone

Writer. Art Historian. Bylines @PopSci @NYTimes @TheAtlantic @NatGeo @NewRepublic @Wired @Longreads & others. Opinions are mine.
Bay Area, CA
4 yrs, 5 mos on Twitter
14,551 28.7%
183.profile imageElizabeth Tasker

UK astrophysicist working at the Japan Aerospace Exploration Agency (JAXA). Author of 'The Planet Factory', published by @sigmascience (views are my own~)
The Planet Factory
7 yrs, 2 mos on Twitter
2,810 28.7%
184.profile imageErik Tollerud

Astrophysicist, Python coder, and general lover of nature in all its forms. Opinions are my own.
Baltimore, MD
9 yrs, 7 mos on Twitter
1,554 28.7%
185.profile imageScott Kelly

9 yrs, 5 mos on Twitter
5,646,880 28.4%
186.profile imageJonathan Amos

BBC Science Correspondent
Cambridge, UK
9 yrs, 0 mos on Twitter
42,517 28.4%
187.profile imageDaniel Fischer

All things astronomy and space (and then some) - in tiny bits and pieces but mostly with links to more ... :-)
Königswinter, Germany
10 yrs, 3 mos on Twitter
12,972 28.4%
188.profile imageBenjamin Pope

Astronomer - he/him
Manhattan, NY
6 yrs, 0 mos on Twitter
2,524 28.4%
189.profile imageJo Dunkley

Professor of Physics and Astrophysics at Princeton. Author of Our Universe.
Our Universe
Princeton, NJ
7 yrs, 3 mos on Twitter
2,393 28.4%
190.profile imageAAS CSWA

The American Astronomical Society Committee on the Status of Women in Astronomy works to improve the status of women in astronomy. Page manager Nancy Morrison.
United States
7 yrs, 1 mo on Twitter
1,904 28.4%
191.profile imageJoss Bland-Hawthorn

All things novel, astrophysical, mathematical, technological.
The Origin of the Galaxy and Loca...
The Galaxy Disk in Cosmological C...
Sydney, Australia
4 yrs, 7 mos on Twitter
1,829 28.4%
192.profile imageJeff Foust

Senior writer, @SpaceNews_Inc. You know the drill: retweets aren't endorsements; opinions here are my own.
Rockville, Maryland, USA
11 yrs, 7 mos on Twitter
34,950 28.2%
193.profile imageDr Jess Wade 👩🏻‍🔬

Physics postdoc @ImperialCollege. @500womensci/ @wes1919 / @wikiwomeninred / @physicsnews enthusiast. I 💜 🔬, 💎s and 🌀s. Least useful doctor in my family.
9 yrs, 11 mos on Twitter
24,784 28.2%
194.profile imageJonathan Fortney

@ucsc Professor & Director of Other Worlds Laboratory. Modeler of planetary atmospheres & interiors. Father, Softballer, Runner, Human Selfie Stick, Minnesotan
Santa Cruz, CA
6 yrs, 11 mos on Twitter
2,282 28.2%
195.profile imageAdrian Price-Whelan

astrophysics postdoc @ Princeton, galaxy dynamics, binary stars, music github.com/adrn
7 yrs, 7 mos on Twitter
1,850 28.2%
196.profile imagePresident Obama

This is an archive of an Obama Administration account maintained by the National Archives and Records Administration (NARA).
Washington, D.C.
3 yrs, 7 mos on Twitter until last tweet (2017-Jan-20)
14,907,995 27.9%
197.profile imageSamantha Cristoforetti

European of Italian nationality. @ESA astronaut. ISS Exp 42/43. Book out Oct 4 (proceeds to @UNICEF_Italia) amzn.to/2xNnkc6 In English in 2019!
7 yrs, 6 mos on Twitter
977,684 27.9%
198.profile imageInstitute of Physics

The Institute of Physics is a leading scientific membership society working to advance physics for the benefit of all.
9 yrs, 8 mos on Twitter
169,187 27.9%
199.profile imageSky & Telescope

The Essential Guide to Astronomy | We provide the world's leading compendium of information about the science and hobby of astronomy.
Cambridge, Mass.
9 yrs, 10 mos on Twitter
102,960 27.9%
200.profile imageNRAO

The National Radio Astronomy Observatory is a facility of the National Science Foundation. Social media policy: bit.ly/2qNhpB3
Charlottesville, VA
10 yrs, 3 mos on Twitter
17,826 27.9%
201.profile imageNancy Atkinson

Science journalist, @universetoday & @Seeker. Author of "Incredible Stories From Space," working on book about Apollo 11
10 yrs, 6 mos on Twitter
11,510 27.9%
202.profile imageLSST Astronomy

The widest, fastest, deepest eye of the new digital age.
Cerro Pachon, Chile
10 yrs, 5 mos on Twitter
5,126 27.9%
203.profile imageAAS Executive Office

The mission of the American Astronomical Society (AAS) is to enhance & share humanity's scientific understanding of the universe.
Washington, DC, USA
8 yrs, 2 mos on Twitter
3,115 27.9%
204.profile imageMatthew Kenworthy

Associate Professor of Astronomy at Leiden Observatory - looking for exoplanets and giant rings, and develops instrumentation to find them. Opinions are my own.
Leiden, The Netherlands
8 yrs, 3 mos on Twitter
1,567 27.9%
205.profile imageWIRED Science

Bringing the radiothermally generated heat. The team: @sandraupson, @JetJocko, @rtg0nzalez, @MeganMolteni, and @MrMattSimon.
San Francisco, California
11 yrs, 3 mos on Twitter
2,014,684 27.6%
206.profile imageNOT ALT WORLD

The #Resistance team against #AltFacts #FauxNews #FauxScience Formerly: Unofficial National Park Service #Science #Climate #Facts Run by non-gov individuals
1 yr, 9 mos on Twitter until last tweet (2017-Feb-07)
1,142,510 27.6%
207.profile imageAAS Press Office

Astronomy news from the Press Office of the American Astronomical Society, managed by Dr. Rick Fienberg. Note: Tweeting is not endorsing, only informing.
8 yrs, 2 mos on Twitter
4,978 27.6%
208.profile imageJohn O'Meara

Father, Astronomer, science policy nerd. Chief Scientist @keckobservatory Cosmic Origins Science Lead for #LUVOIR Chair AAAC. Tweets are my own
Essex Junction, Vermont
9 yrs, 4 mos on Twitter
1,269 27.6%
209.profile imageJim Al-Khalili

Professor of theoretical physics, author, broadcaster and humanist. President of @BritSciAssoc. "Affable Egghead" (Sunday Times).
University of Surrey
9 yrs, 0 mos on Twitter
125,398 27.3%
210.profile imageMatt Taylor

I work at ESA on the Rosetta mission. 501st Dutch Garrison TK67676 EIB
6 yrs, 3 mos on Twitter
33,853 27.3%
211.profile imageThe Jupiter Girl

Molecular Biology, Nanotechnology| Space | Astropalaeontology | Co-founder, @realscientists | Dinosaur Evangelist |
Narrm, Kulin Nation, Australia
8 yrs, 4 mos on Twitter
32,833 27.3%
212.profile imageRadio Astrology

Opening new windows in the prediction spectrum. Astrology at long wavelengths.
In the stars (and the ISM)
7 yrs, 2 mos on Twitter
3,628 27.3%
213.profile imageAstronomy Meetings

Sharing astronomy meeting twitter links. Send me your conference title, #tag and url, **when the meeting starts**, and I'll RT to distribute. @AstroRJS
4 yrs, 8 mos on Twitter
1,282 27.3%
214.profile imageSquareKilometreArray

The SKA will be the world's largest radio telescope, located in Africa & Australia. Tweets from the SKA Global Headquarters @jodrellbank.
Jodrell Bank (UK)
8 yrs, 3 mos on Twitter
19,045 27.1%
215.profile imagePriyamvada Natarajan

@Yale astrophysicist, works on exotica in the universe: dark matter, black holes; Author: Mapping the Heavens • https://t.co/DuzePWpq2N
Mapping the Heavens
The Shapes Of Galaxies and their ...
New Haven, CT
2 yrs, 10 mos on Twitter
9,051 27.1%
216.profile imageEric Mamajek

astronomer, dad, reader of stellar tea leaves, searcher of extrasolar needles in haystacks. The statements and opinions posted here are my own.
Pasadena, CA
7 yrs, 11 mos on Twitter
2,082 27.1%
217.profile imageHubbleTelescope

News from the Hubble Space Telescope operated by @stsci
10 yrs, 6 mos on Twitter
134,318 26.8%
218.profile imageLisa Grossman

Astronomy reporter at Science News, lifelong astronomy nerd. Ideas my own. She/her/hers
Cambridge, MA
9 yrs, 10 mos on Twitter
7,672 26.8%
219.profile imageSara Seager

Prof. Seager is an astrophysicist and planetary scientist at MIT. A pioneer in the vast world of exoplanets, she's on a quest for the holy grail: another Earth.
Exoplanets (Space Science Series)
Exoplanet Atmospheres
Cambridge, MA
8 yrs, 3 mos on Twitter
7,320 26.8%
220.profile imageArfon Smith

Head of Data Science @stsci. Ex GitHubber. Zooniverse co-founder. Editor-in-chief of The Journal of Open Source Software.
Baltimore, MD
12 yrs, 0 mos on Twitter
4,191 26.8%
221.profile imageDr Megan Argo

By day: just another transient astronomer. By night: samba drumming, rock climbing, public speaker, teacher and science advocate. facebook.com/DrMeganArgo
Planet Earth
9 yrs, 10 mos on Twitter
3,541 26.8%
222.profile imageSAO/NASA ADS

8 yrs, 0 mos on Twitter
2,326 26.8%
223.profile imageDianna Cowern

Assume a spherical cowern in a vacuum... kauai-grown, #MIT physics, YouTube videos. Pls respond to tweets w bad puns.
San Diego
6 yrs, 10 mos on Twitter
96,608 26.5%
224.profile imageLego Academics

The female academics of the Lego Research Institute take on the challenges of modern academia. CC-BY-NC-SA
Lego Research Institute
4 yrs, 5 mos on Twitter
74,109 26.5%
225.profile imageJennifer Ouellette

Science writer Jennifer Ouellette. Senior reporter, Ars Technica. Past: Gizmodo. Ex-evangelical. Married to @seanmcarroll.
Los Angeles, CA
8 yrs, 9 mos on Twitter
36,380 26.5%
226.profile imageHistory of Astronomy

Multidisciplinary & multicultural history of astronomy #histastro by @VoulaSaridakis, Ph.D. | Curator, Museum of Science and Industry, Chicago @msichicago.
All tweets/views/opinions mine
3 yrs, 10 mos on Twitter
20,297 26.5%
227.profile imageThomas Zurbuchen

Associate Administrator, @NASA Science Mission Directorate
Washington, DC
7 yrs, 10 mos on Twitter
19,993 26.5%
228.profile imagegalaxyzoo

It's Galaxy Zoo!
10 yrs, 0 mos on Twitter
13,550 26.5%
229.profile imageDr Tabetha Boyajian

Assistant professor of Astrophysics at #LSU. disrupter of astrophysics; #BoyajiansStar #TabbysStar; all posts here are my own
Extrasolar Planets and Their Host...
Baton Rouge, LA
9 yrs, 5 mos on Twitter
9,654 26.5%
230.profile imageLaura Lopez

Astronomy professor at Ohio State
6 yrs, 2 mos on Twitter
1,468 26.5%
231.profile imageNational Science Foundation

Explore #NSFfunded research that is transforming the world. / Social media policy: bit.ly/smpnsf
Alexandria, VA
10 yrs, 4 mos on Twitter
1,084,806 26.3%
232.profile imageNASA's OSIRIS-REx

NASA's first asteroid sampling spacecraft. I'm on a 7-year mission to return a pristine sample from asteroid Bennu.
In orbit around Bennu
10 yrs, 7 mos on Twitter
72,558 26.3%
233.profile imageAlan Boyle

Aerospace and science editor @GeekWire. Longtime blogger @CosmicLog. Author of "The Case for Pluto." Links/RTs ≠ endorsements
10 yrs, 10 mos on Twitter
34,857 26.3%
234.profile imageAndy Rivkin

Planetary astronomer on #TeamAsteroid; Gedankenband member and guitarist; Persistently Obstreperous.
#USAstronomyGoodwillAmbassador ⊗
10 yrs, 7 mos on Twitter
4,375 26.3%
235.profile imageAndrew Pontzen

I do cosmology. Employed by UCL, funded by the Royal Society. Tweeting in a personal capacity: it’s no-one else’s fault when I talk nonsense.
8 yrs, 5 mos on Twitter
3,178 26.3%
236.profile imageAstropy

This is the official twitter account for the Astropy project.
7 yrs, 5 mos on Twitter
2,764 26.3%
237.profile imageAndy Lawrence

Quasar fan and survey nut. Check out random Milky Way snaps @MilkyWayBot, Oculus/Stellarium project @StarsightVR and its crowdfunder crowdfunder.co.uk/starsight-vr/
Probability in Physics
Astronomical Measurement
Auld Reekie
8 yrs, 9 mos on Twitter
2,017 26.3%
238.profile imageIntl. Space Station

NASA's page for updates from the International Space Station, the world-class lab orbiting Earth 250 miles above. For the latest research, follow @ISS_Research.
Low Earth Orbit
5 yrs, 7 mos on Twitter
2,382,440 26.0%
239.profile imageDr. Brian May

Rocket Ship Builder 🚀🚀🚀🚀🚀
6 yrs, 3 mos on Twitter
860,942 26.0%
240.profile imageNASA Voyager

The official account for NASA’s twin Voyager 1 & 2 spacecraft, the longest operating spacecraft in deep space. 🛰 Mission team headquartered at @NASAJPL
Interstellar space
8 yrs, 4 mos on Twitter
540,277 26.0%
241.profile imageDr Jen Gupta

Space nerd. @UoPCosmology astronomy outreach. @SeldomSirius podcaster. @TWBBC Live presenter. @WinSciFest. Active Galaxies were my 1st love. Own views [she/her]
Winchester, UK
9 yrs, 5 mos on Twitter
4,427 26.0%
242.profile imageJonathan Pritchard

Imperial astrophysicist and bewildered vagabond. Reader. SKA enthusiast. @ERC_research funded (opinions mine, not employer's)
Richmond, London
8 yrs, 0 mos on Twitter
1,654 26.0%
243.profile imageLiz B ☆

X-ray and Optical Astronomer at @ESO. FLAMES Instrument Scientist. Bleeding heart liberal & intersectional feminist. All views my own. Ⓥ #ActualLivingScientist
Santiago, Chile
6 yrs, 10 mos on Twitter
1,471 26.0%
244.profile imageHillary Clinton

2016 Democratic Nominee, SecState, Senator, hair icon. Mom, Wife, Grandma x2, lawyer, advocate, fan of walks in the woods & standing up for our democracy.
New York, NY
5 yrs, 9 mos on Twitter
23,919,139 25.7%
245.profile imageNASA_TESS

This is the official @NASA Twitter for the Transiting Exoplanet Survey Satellite (TESS). @NASA_TESS will perform an all-sky survey to discover new exoplanets
Goddard Space Flight Center
5 yrs, 4 mos on Twitter
45,778 25.7%
246.profile imageStuart Clark

Astronomer, journalist, author. The Sky's Dark Labyrinth. Writes Across the Universe for The Guardian. Co-hosts The Stuniverse podcast. Dyed-in-the-wool progger
The Unknown Universe
Is There Life On Mars?
Little Moon
9 yrs, 8 mos on Twitter
35,405 25.7%
247.profile imageKaren James ❄️

In which a rogue scientist & outdoorswoman tweets about molecular ecology, genetics, evolution, botany, space, feminism & social justice, but in reverse order.
Bar Harbor, ME
10 yrs, 2 mos on Twitter
29,578 25.7%
248.profile imageGuardian Science

Science, health and environment news from the @Guardian. Plus, independent comment and analysis from our network of expert science bloggers
9 yrs, 10 mos on Twitter
1,064,005 25.5%
249.profile imageJohn Grunsfeld

Former lead for Science at NASA (Associate Administrator) Astronaut STS-67,81,103,109,125 Hubble Hugger, Space and Earth explorer
5 yrs, 11 mos on Twitter until last tweet (2018-Jan-11)
32,047 25.5%
250.profile imageEmily Baldwin

Space Science Editor at EJR-Quartz for ESA, based at ESTEC. Tweets about space, running, coffee. Opinions own.
Leiden, Netherlands
9 yrs, 10 mos on Twitter
4,948 25.5%
251.profile imageLisa Randall

Physicist and author. Dark Matter and the Dinosaurs,Warped Passages,Knocking on Heaven's Door,Higgs Discovery. Opinions expressed are not solely my own.
8 yrs, 0 mos on Twitter
56,772 25.2%
252.profile imageMiriam Kramer

Always a space reporter. It's not aliens. It's never aliens. DMs open and a mess.
Now: NYC. Before: Tennessee.
8 yrs, 8 mos on Twitter
17,283 25.2%
253.profile image★ Colin Stuart ★

Astronomy author & speaker. Get a free e-book @ bit.ly/2zjaIee. See www for signed books, keynotes & school talks. Asteroid (15347) Colinstuart
How to Live in Space
Fabulous Figures and Cool Calcula...
10 yrs, 1 mo on Twitter
5,981 25.2%
254.profile imageGiant Magellan

The first “Extremely Large Telescope” seeking to unlock the mysteries of the universe.
Las Campanas, Chile
7 yrs, 7 mos on Twitter
5,324 25.2%
255.profile imageMark McCaughrean

Senior Advisor for Science & Exploration at the European Space Agency. Well aware of the (in)significance of being recycled starstuff. Opinions very much own.
The Origins of Stars and Planets
The Origins of Stars and Planets
Wassenaar, The Netherlands
3 yrs, 5 mos on Twitter
5,097 25.2%
256.profile imageKimberly EnnicoSmith

Scientist fueled by tea. Inspired by many. Passionate about space exploration, human & robotic. The unexpected can be expected with confidence.
Mountain View, CA
10 yrs, 10 mos on Twitter
3,765 25.2%
257.profile imageKristin Block

Spacecraft pro, taiko player, bassist, percussionist. Miami-Tucson-Bay Area. (Not affiliated with the mission @Maven2Mars!) Opinions my own and queer.
San Jose, CA
9 yrs, 7 mos on Twitter
3,605 25.2%
258.profile imageRobert Massey

Dad, Deputy Executive Director @royalastrosoc, chair @lightyear_fdn. Co-author of Moon: Art, Science, Culture with @saschaloske. See bit.ly/2PpjMn0
Bristol (Southville) & London
9 yrs, 5 mos on Twitter
2,800 25.2%
259.profile imageStephen Serjeant

Astronomy Prof at Open University,occasionally does OU/BBC stuff. 26.2mi=42.2km.Remainer. Likes often=bookmarks. Views here do not necessarily blah blah. He/him
An Introduction to Galaxies and C...
Observational Cosmology
9 yrs, 9 mos on Twitter
2,237 25.2%
260.profile imageThe Royal Society

The Royal Society is a Fellowship of the world's most eminent scientists and is the oldest scientific academy in continuous existence. fb.com/theroyalsociety
London, UK
9 yrs, 9 mos on Twitter
217,316 24.9%
261.profile imageAmy Mainzer

Jet Propulsion Laboratory
5 yrs, 11 mos on Twitter
26,602 24.9%
262.profile imageCarnegie Astronomy

Bringing you astronomy from The Carnegie Institution for Science: The Observatories in Pasadena, CA, DTM in Washington DC, and Las Campanas Observatory in Chile
Pasadena, CA
3 yrs, 11 mos on Twitter
5,994 24.9%
263.profile imageJill Tarter

Earthling, chief cheerleader for SETI, setiQuest, and the Allen Telescope Array Jack's wife - Shana's mom - Li Yao and Clara's grandma
Earth in the Cosmos
9 yrs, 10 mos on Twitter
4,722 24.9%
264.profile imageAriel Waldman

NASA advisor. Antarctic explorer. Author of amzn.to/1MFUEVC. Global director @ScienceHackDay. YouTuber youtube.com/arielwaldman.
San Francisco
11 yrs, 10 mos on Twitter
32,834 24.7%
265.profile imageEllen Stofan

John and Adrienne Mars Director of National Air and Space Museum, Planetary geologist, STEM advocate, former Chief Scientist of NASA. My tweets are my own.
Exploring Venus as a Terrestrial ...
Washington, DC
6 yrs, 11 mos on Twitter
11,286 24.7%
266.profile imageSpace Telescope Live

What is @HubbleTelescope looking at? –Reference images from @STScI Digitized Sky Survey and Sloan Digital Sky Survey Data Release 13 (not actual Hubble images)
Low Earth Orbit
2 yrs, 4 mos on Twitter
9,469 24.7%
267.profile imageChris North

Lecturer & astronomer @CardiffPHYSX. Co-author of cosmos-book.github.io + other books, semi-regular broadcaster. Comments own. [he/his]
The Sky at Night
How to Read the Solar System
Cardiff (normally)
9 yrs, 3 mos on Twitter
5,372 24.7%
268.profile imageAwesome_Ph

The most awesome(st) of Astro-ph every day! Few one line summaries of papers on the ArXiV that caught my attention. Brought to you by the Extronomer.
7 yrs, 8 mos on Twitter
1,965 24.7%
269.profile imageDra. Nicole

STEM Inclusion Consultant | Astronomy PhD and STEM equity advocate | She/Her/Hers | #LatinaInSTEM | I have the best ideas.
4 yrs, 3 mos on Twitter
1,837 24.7%
270.profile imageAngela Speck

Tattooed witchy astrolator; stellar mortician, empress of the eclipse, queen of astromineralogy; SJW; currently living in the Midwest.
Columbia, MO
7 yrs, 9 mos on Twitter
1,788 24.7%
271.profile imageDustin Lang

Astronomer at @Perimeter. Farm-raised left-handed vegetarian Canadian socialist. Tweets often astronomical/computational/scatological. he/Dr
Waterloo, Canada
5 yrs, 0 mos on Twitter
1,345 24.7%
272.profile imageStephen Colbert

the guy on CBS
10 yrs, 4 mos on Twitter
18,346,747 24.4%
273.profile imageKim Kowal Arcand

Visualization & emerging tech lead for @chandraxray; public speaker; co-author of 4 popular science books. Opinions=my own 🛰https://t.co/PFs60ywY5f
10 yrs, 10 mos on Twitter
8,319 24.4%
274.profile imageDr. Caryl Gronwall

Astronomer at Penn State University
State College, PA
7 yrs, 10 mos on Twitter
1,246 24.4%
275.profile imageNate Silver

Editor-in-Chief, @FiveThirtyEight. Author, The Signal and the Noise (amzn.to/QdyFYV). Sports/politics/food geek.
New York
10 yrs, 4 mos on Twitter
3,192,844 24.1%
276.profile imageNASA Kennedy / KSC

Official Tweets from NASA's Kennedy Space Center
Florida, USA
10 yrs, 3 mos on Twitter
1,452,061 24.1%
277.profile imageAmy Shira Teitel

SPACEFLIGHT HISTORIAN. Book: bit.ly/astbtcog. Vintage Space: bit.ly/vintagespace. Patreon: patreon.com/amyshirateitel PAO = my PAO.
Los Angeles, CA
8 yrs, 1 mo on Twitter
225,386 24.1%
278.profile imageESA Planck

A European Space Agency (ESA) spacecraft to understand the origin and evolution of our Universe
L2: 1,000,000 miles from Earth
9 yrs, 4 mos on Twitter until last tweet (2017-Oct-14)
47,266 24.1%
279.profile imageWill Gater

Astronomer, journalist & space geek willgater.com | willgaterastrophotography.com | instagram.com/willgater
10 yrs, 7 mos on Twitter
7,942 24.1%
280.profile imageAstronomy On Tap HQ

🌟Professional astronomers reveal how they explore the Universe, at bars & pubs around the world!🌟HQ account follows satellite locations, organizers, & venues.
5 yrs, 11 mos on Twitter
2,663 24.1%
281.profile imageDerek Fox

Research astronomer and faculty member at Penn State University. This is a personal Twitter account.
9 yrs, 10 mos on Twitter
2,370 24.1%
282.profile imageNational Geographic

Taking our understanding and awareness of the world further for 130 years | Test your knowledge with our Messenger chatbot: on.natgeo.com/2Om55Qk
10 yrs, 1 mo on Twitter
22,445,679 23.9%
283.profile imageChandra Observatory

Chandra's ongoing mission is to study the X-ray Universe. Operated for NASA by Smithsonian Astrophysical Observatory. Legal: s.si.edu/legal
In orbit
11 yrs, 0 mos on Twitter
165,655 23.9%
284.profile imageNASA Spitzer

NASA's Spitzer Space Telescope - the infrared Great Observatory. Observes asteroids, comets, extrasolar planets, stars, galaxies and more...
Pasadena, CA.
8 yrs, 9 mos on Twitter
116,840 23.9%
285.profile imageMeg Rosenburg

planetary science PhD | #scicomm & #histSTM | freelancer, filmmaker, podcaster | megrosenburg.com | And what you do, do it unfeignedly.
Somerville, MA
6 yrs, 1 mo on Twitter
4,987 23.9%
286.profile imagePaul Crowther

@PhysicsShef Head of Dept at @unisheffield. Prof of Astrophysics mostly researching Monster Stars. Interested in UK sci policy esp @STFC_Matters's ups & downs
Peoples Republic of Sheffield
9 yrs, 1 mo on Twitter
2,722 23.9%
287.profile imageMark Marley

Astronomer working for a well known national space agency. Interests include extrasolar planets, brown dwarfs, giant planets. Opinions are mine alone.
Brown Dwarf Variability
Mountain View, California
8 yrs, 5 mos on Twitter
2,102 23.9%
288.profile imageStephen Fry

How can I tell you what I think until I’ve heard what I’m going to say? 🏳️‍🌈 (Never read DMs I’m afraid)
Los Angeles, CA/ London UK
10 yrs, 6 mos on Twitter
12,738,817 23.6%
289.profile imageUK Space Agency

Official Twitter channel of the UK Space Agency. We're at the heart of UK efforts to explore and benefit from space.
Swindon, England
9 yrs, 3 mos on Twitter
202,616 23.6%
290.profile imageCaroline Morley

Assistant Prof at UT Austin, modeler of substellar atmospheres
Austin, TX
6 yrs, 3 mos on Twitter
1,800 23.6%
291.profile imageJohn Debes

STIS Team Lead at @stsci. Part of @diskdetective and @NASAWFIRST CGI science team. Exoplanets, white dwarf planets, and disks. My opinions are my own. He/Him
Geektown, USA
6 yrs, 2 mos on Twitter
1,054 23.6%
292.profile imageDr. Abbie

#ActualLivingScientist #WomenInSTEM👩🏻‍💻 NSF fellow @msu_astro & @michiganastro🔭 compact objects💥 #OpenSource pythoner🐍 tea enthusiast🍵she/her♀ views mine
Anishinaabeg/Odawa land
7 yrs, 11 mos on Twitter
1,663 23.3%
293.profile imageMike Massimino

Former @NASA astronaut, Professor at Columbia @CUSEAS, Sr. Advisor for Space Programs @IntrepidMuseum, Author of #Spaceman
New York, NY
9 yrs, 9 mos on Twitter
1,213,154 23.1%
294.profile imageBrian Greene

Physicist, Author, Co-founder @WorldSciFest
New York, NY
6 yrs, 7 mos on Twitter
1,017,329 23.1%
295.profile imageXKCD Comic

XKCD comic feed with images, mobile friendly links, and what-if articles. Unofficial, run by @dghubble
5 yrs, 1 mo on Twitter
202,697 23.1%
296.profile imageEli Bressert

Love big ideas and putting them into action by connecting the impossible.
SciPy and NumPy
California, USA
10 yrs, 2 mos on Twitter
2,506 23.1%
297.profile imageDr. Jillian Scudder

PhD in astrophysics & assistant professor at @oberlincollege. I study galaxies & write @astroquizzical. I wrote a book! she/hers.
6 yrs, 5 mos on Twitter
2,102 23.1%
298.profile imageStephanie Juneau

Associate Astronomer at @NOAONorth. Project Scientist for @NOAODataLab. Coffee & dark chocolate addict. Fan of #blackHoles #art #sciart #rockclimbing
4 yrs, 7 mos on Twitter
887 23.1%
299.profile imageACLU

The ACLU is a nonprofit, nonpartisan, legal and advocacy 501(c)(4) organization. Visit our site for more about us and our affiliated org, the ACLU Foundation.
All 50 states
10 yrs, 11 mos on Twitter
1,560,094 22.8%
300.profile imageNASA History Office

This is the NASA History Office's official Twitter account. We're happy that you share our passion for aerospace history.
Washington, DC
8 yrs, 7 mos on Twitter
840,339 22.8%