Related by context. Frequent words. (Click for all words.) 46 Gene Cernan 46 Sandra Magnus 45 Mission Specialists 45 Today Birthdays Singer 45 aboard Atlantis 44 orbited Earth 44 Gliese #g 44 Ron Garan 44 astronaut Daniel Tani 44 ISS Expedition 43 Earthlike 43 Frank Borman 43 Gus Grissom 43 Randolph Bresnik 42 HD #b [002] 42 Tim Kopra 42 orbiting 42 Richard Feynman 42 Keir Dullea 42 Edwin Buzz Aldrin 41 NASA Kepler 41 astronomical objects 41 Soviet cosmonaut Yuri Gagarin 41 Japanese astronaut Koichi 41 Julie Payette 40 Koichi Wakata 40 spacecraft orbiting 40 Kirk Whalum 40 Nicole Stott 40 volcanically active 40 planets orbiting 40 habitable planets 40 Alexander Kaleri 40 Japanese astronaut Soichi 40 Neil deGrasse Tyson 40 Bearing External Resistance Treadmill 40 WASP #b 39 Apollo missions 39 astrobiologists 39 NASA Goddard 39 Eartha 39 habitable planet 39 Piers Sellers 39 Ethelyn 39 astronaut Gregory Chamitoff 39 habitable zones 39 Oleg Skripochka 39 Metcalf Lindenburger 39 Cernan 39 planet orbiting 39 NASAs 39 terrestrial planets 39 Planetarium 39 commander Rick Sturckow 39 dwarf planets 39 X ray telescope 39 planets 39 Earnestine 38 NASA astronaut 38 LaWanda 38 rocky planets 38 NASA Astronaut 38 moon Europa 38 Timothy Kopra 38 astronaut 38 Fyodor Yurchikhin 38 Carl Sagan 38 nebulas 38 Keck Observatory 38 Rick Mastracchio 38 Nannie 38 planetarium 38 Mercury Gemini 38 Dorothy Metcalf Lindenburger 38 Lalah Hathaway 38 Astronaut 38 kitchenettes 37 super Earths 37 interplanetary spacecraft 37 Mikhail Kornienko 37 Krikalev 37 Commander Eileen 37 Owen Garriott 37 Richard Linnehan 37 Astronomer 37 Apollo astronauts 37 Combined Operational Load 37 astronomer 37 Robert Curbeam 37 extrasolar planets 37 Shalonda 37 Jackie 37 orbits 37 Lunine 37 lunar landing 37 Janice 36 Russian cosmonaut Gennady Padalka 36 Wanda 36 Saturn moons 36 polar caps 36 Space Shuttle Endeavor