Astronomy
Science Channel
Thought-provoking updates, insider news and more from Science...show your #nerdtweet pride!511,332 followers | Follow
Astro Pic Of The Day
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.415,504 followers | Follow
The SETI Institute
We believe we are conducting the most profound search in human history — to know our beginnings and our place among the stars.219,095 followers | Follow
NASA Kepler
The Kepler Mission is designed to survey our region of the Milky Way galaxy to discover Earth-size planets in the habitable zone.215,408 followers | Follow
CassiniSaturn
Cruising around Saturn, its moons and the magnificent rings194,624 followers | Follow
Spirit and Oppy
Roaming the Red Planet on six wheels since Jan 2004. The official mission Twitter of the Spirit and Opportunity rovers.152,993 followers | Follow
NASA Astronauts
Hear from all NASA's astronauts on Twitter, plus updates on astronaut activities here.136,303 followers | Follow
Discovery Space
The space topic hub for @Discovery_News. All things astronomy, physics, cosmology, spaceflight, NASA, exoplanets & more! (Administered by @astroengine.)28,319 followers | Follow
LCROSS_NASA
NASA mission to explore the Moon to look for water ice at the poles! And I found it! My mission (and my tweets) ended Oct 9, 2009. But, I'm forever on the moon!25,371 followers | Follow
Space Fellowship
An international news and information network dedicated to the space industry.22,164 followers | Follow
Astronomy Magazine
Astronomy informs, entertains, and inspires people who are interested in the science and hobby of astronomy.14,625 followers | Follow
WI Astronomy
A Wisconsin based Space and Astronomy News public outreach website.14,136 followers | Follow
Astronomy Tweets
Talking about astronomy, planets, earth and space issues and concerns impacting our atmosphere - YES I follow back and promise you there will be ZERO DMs!!! :)13,452 followers | Follow
Sky and Telescope
The Essential Magazine of Astronomy. Sky and Telescope is the world's leading compendium of information about the science and hobby of astronomy.12,712 followers | Follow
AF Space Command
Official Air Force Space Command Twitter: Stay up to date on all things AF Space!11,149 followers | Follow
Pamela L. Gay
Communicating astronomy and life in academia 1 sidereal day at a time.10,474 followers | Follow
Spitzer Telescope
Capturing the infrared spectrum since 2003. For the official feed follow @NASAspitzer.7,817 followers | Follow
Asteroids and Comets
Reports asteroids and comets closest approaches to earth7,121 followers | Follow
Adler Planetarium
The Adler Planetarium in Chicago invites you to join us in exploring space!6,554 followers | Follow
Exoplanetology.com
The Art and Science of New Worlds. Explores the impact of Exoplanet discoveries on Humanity's Culture and Future. http://bit.ly/Twanifesto6,456 followers | Follow
Irene Klotz
Journalist specializing in NASA, space science, commercial space. Media consultant.3,612 followers | Follow
LunarOrbiter
Providing New Imagery and Data From the 1960's NASA Lunar Orbiter Missions For 21st Century Exploration3,290 followers | Follow
Aerospace tweeters!!
Follow me @aeroG. This is a listing of all the aviation & space-related twitters I can find!2,579 followers | Follow
Galilean Nights
Take part in public observations of gas giant Jupiter, its moons, the Sun and our Moon 22-24 October 20092,320 followers | Follow
Portal to Universe
Keep up to date with latest cutting-edge astronomy and space science breakthroughs via Portal To The Universe. (An original IYA2009 Project)2,255 followers | Follow
Starry Night EDU
The leader in space science curriculum solutions and the maker of Starry Night astronomy software.2,163 followers | Follow
Susan Niebur
Women make up half the bodies in the solar system -- why not half the scientists?2,040 followers | Follow
Big Picture Science
Big Picture Science is a weekly science radio program hosted by Seth Shostak and Molly Bentley. Hear it on iTunes, your local NPR station, or at radio.seti.org1,989 followers | Follow
Telescope webcast
Around the World in 80 Telescopes - a 24-hour live webcast from the most advanced telescopes on and off the planet! Part of "100 Hours of Astronomy".1,657 followers | Follow
Shuttle Atlantis
A fun take on Space Shuttle Atlantis (note, we're not NASA)1,574 followers | Follow
Physics to Go
Explore physics on your own with Physics to Go, an outreach website produced by the American Physical Society.1,519 followers | Follow
PhysicsCentral
Tweets about what's going on in physics, who's doing what in physics, and how things work. Brought to you by @APSPhysics1,505 followers | Follow
Dark Sky Festival
9th Annual Dark Sky Festival at Harmony. April 14, 2012 Be Part of the Solution, Fight Light Pollution!1,349 followers | Follow
Ashley Beginn
1,290 followers | Follow
Astronomy & Space 2U
The Quest: To explore the unexplored. To discover the undiscovered. To know the unknown.976 followers | Follow
New Astronomy Books
All new astronomy book releases posted on their publication day803 followers | Follow
IYA2009-Ireland
Updates about astronomy-related events happening this year in Ireland780 followers | Follow
Project Black Cat
SETI (the Search for Extraterrestrial Intelligence) is like SEARCHING FOR A BLACK CAT IN A DARK ROOM. Not an easy task, but very important and worth the effort.349 followers | Follow
AstronomyNovaScotia
ANS is a collective of amateur and professional astronomers in Nova Scotia bound by a love of astronomy and the urge to share this with the public.288 followers | Follow
