#1

NASA NASA 157,998 followers (30 on this list)
Bio News from NASA
Location 
Web http://www.nasa.gov
Other lists:  aerospace-aviation, government, nasa

#2

UFO4U Danny Shook 28,612 followers
Bio I am an #American #NEWS ADDICT living in #Germany-I #FollowBack, however, I #Block those who choose only to be followed, it's a hobby of mine.
Location Dreieich, Germany
Web http://ufo4u.blogspot...
Other lists:  followback, green, health, news, odd, people, psychology, science, technology

#3

CassiniSaturn CassiniSaturn 11,662 followers (15 on this list)
Bio Cruising around Saturn, its moons and the magnificent rings
Location Saturn, Solar System
Web http://saturn.jpl.nas...
Other lists:  nasa

#4

NASAKepler NASA Kepler I am 9,675 followers (13 on this list)
Bio Starting the search for other Earth-like planets in our Milky Way Galaxy
Location Trailing Earth around the Sun
Web http://www.nasa.gov/m...

#5

nasahqphoto NASA HQ PHOTO 7,836 followers (7 on this list)
Bio NASA Headquarters Photo Department
Location Washington, DC
Web http://www.nasa.gov
Other lists:  aerospace-aviation, nasa, photography

#6

VirtualAstro Virtual Astronomer 6,812 followers (6 on this list)
Bio (Previously NewburyAS) Fun Astronomy, Space, Science, nature and more by @AdrianWest Creator of #Meteorwatch. Look up and enjoy the sky!
Location Newbury, United Kingdom
Web http://meteorwatch.or...
Other lists:  science

#7

waybis waybis 6,780 followers (14 on this list)
Bio My mishmash of selected links, thoughts and commentary on Space Exploration, Astronomy, Space Science, Cosmology and SciFi topics
Location 
Web http://www.waybis.co....
Other lists:  nasa, nasa

#8

BernardHarris Dr. Bernard Harris 6,414 followers (15 on this list)
Bio Fmr astronaut, 1st African American to walk in space, physician, businessman. Working to change education pls join me facebook.com/ drbernardharrisjr
Location Houston, TX
Web http://www.theharrisf...
Other lists:  african-american, education

#9

glxp Google Lunar X PRIZE 4,487 followers (21 on this list)
Bio The official Google Lunar X PRIZE Twitter account. Going back to the moon, and taking you with us.
Location 
Web http://www.googleluna...
Other lists:  astronomy, prizes

#10

NASAWatch NASA Watch 4,246 followers (11 on this list)
Bio
Location 
Web http://www.nasawatch....
Other lists:  nasa

#11

NASA_Ames NASA Ames 4,180 followers (14 on this list)
Bio Weaving space into the fabric of the (real-time) web...
Location Silicon Valley
Web http://www.nasa.gov/a...

#12

NASA_Ares_I_X Ares I-X 3,773 followers (10 on this list)
Bio First flight test for America's Next Generation Rocket
Location USA
Web http://www.nasa.gov/a...
Other lists:  nasa

#13

youngtaeko 고영태 3,635 followers
Bio Parallel importing business, global brand clothing ACC. Marketing www.styleship.com
Location Seoul
Web http://jeje108.blog.m...
Other lists:  android, car, icecream, strawberry, ufo

#14

NLSI NASA Lunar Science 3,334 followers (9 on this list)
Bio Moon science rocks.
Location NASA Ames Research Center, CA
Web http://lunarscience.n...
Other lists:  science

#15

Spacevidcast Spacevidcast 2,849 followers (22 on this list)
Bio Making Space Commonplace! New media company looking to the stars.
Location Minneapolis, MN
Web http://www.spacevidca...
Other lists:  nasa

#16

iain_gray Iain Gray 2,798 followers
Bio CEO of Technology Strategy Board
Location Swindon
Web http://www.innovateuk...
Other lists:  cleantech, energy, entrepreneurship, ev, health, innovation, ktp, sbri, technology

#17

OdysseyMoon Odyssey Moon 2,773 followers (10 on this list)
Bio Odyssey Moon is a commercial lunar enterprise pursuing the Google Lunar X PRIZE. PLEASE FOLLOW US AT @Odyssey_Moon (http://twitter.com/Odyssey_Moon)
Location Isle of Man, U.S. & Canada
Web http://odysseymoon.co...
Other lists:  space-astronautics, space-exploration

#18

NASA_HSF U.S. HSF Committee 2,722 followers (16 on this list)
Bio The Committee will conduct an independent review of ongoing U.S. human space flight plans and programs, as well as alternatives.
Location Washington, DC
Web http://hsf.nasa.gov
Other lists:  government, nasa, space-astronautics

#19

Discovery_Space Discovery Space 2,550 followers (10 on this list)
Bio Discovery Space: everything astronomy, cosmology, physics, NASA, space travel, aliens, exoplanets, Mars and more... Maintained by @astroengine
Location Earth, Sol, Milky Way
Web http://dsc.discovery....
Other lists:  mars, nasa, science

#20

unfolding Metaconscious 2,323 followers (1 on this list)
Bio Reality hacker in search of modern day shamans.
Location Milwaukee, ♁
Web http://metaconscious....
Other lists:  art, astronomy, design, music, philosophy, photography, psychology, science, spirituality