Related by context. Frequent words. (Click for all words.) 48 Discovery 40 DISCOVERY 38 Shuttle Discovery 37 undock 35 Expedition 34 Lee Archambault 34 Space shuttle Atlantis 34 Space Shuttle Atlantis 34 Space Shuttle Discovery 33 Shuttle Atlantis 33 Spacewalkers 33 Nicole Stott 33 Liftoff 32 space shuttle Discovery 32 Shuttle Endeavour 31 Endeavor 31 Orbiter 31 Voyager 31 thermal tile 31 Space Station 31 heat shield 31 Ares IX 30 STS 30 Discovery Communications 30 Space Shuttle Endeavour 30 shuttle Atlantis 29 NASA Space Shuttle 29 Science 29 orbiter 29 Space shuttle Discovery 29 Discovery Channel 28 liftoff 28 NASA 28 ISS 28 Endeavour 28 Atlantis 28 commander Rick Sturckow 28 International Space Station 27 Spaceflight 27 Mars Rover 27 spacecraft 27 shuttle Discovery 27 orbiting laboratory 27 Endeavour astronauts 27 Space Shuttle 27 space shuttle 27 Soyuz 26 Astronaut 26 thermal tiles 26 shuttle Endeavour 26 Nasa 26 Shuttle 26 Astronauts 26 Krikalev 26 Eileen Collins 26 aboard Endeavour 26 Space Shuttle Program 26 Space shuttle Endeavour 26 David Zaslav 25 space shuttle Endeavour 25 Explorer 25 Discovery astronauts 25 space shuttle Atlantis 25 Garrett Reisman 25 Soyuz capsule 25 Fincke 25 Shark Week 25 Adler Planetarium 24 spacewalk 24 astronauts 24 Challenger Learning 24 Cape Canaveral 24 Soyuz rocket 23 Space 23 Foale 22 Kibo 22 Nat Geo 22 Kennedy Space 22 space shuttles 22 LCROSS 21 Aldrin 21 shuttle missions 21 Apollo 21 Soyuz spacecraft 21 blastoff 20 Zaslav 20 Gemini 20 Opportunity 20 shuttle 20 Hubble 20 Trek 19 Imagination Station 19 Planet Earth 19 shuttle astronauts 18 National Geographic 18 Mars 18 Harmony 18 Adventure 14 Smithsonian 12 Discover 7 Scripps