Related by context. Frequent words. (Click for all words.) 70 perigee 61 elliptical orbit 60 autumnal equinox 59 circular orbit 59 planet orbits 57 constellation Leo 57 ecliptic 57 equator 57 orbits 56 equinox 56 equinoxes 56 spring equinox 55 umbra 55 Sedna 55 Uranus 54 Geminids 54 distant galaxy 54 annular eclipse 54 HD #b [002] 54 Andromeda Galaxy 53 vernal equinox 53 Kuiper belt 53 Cabeus crater 53 Jupiter Saturn 53 constellation Perseus 53 geosynchronous orbit 53 sunspot cycle 53 ringed planet 52 supermoon 52 comet nucleus 52 summer solstice 52 Perseids 52 Cancri 52 sunspot numbers 52 moonrise 52 GeV 52 AP Political NewsBrief 52 occultation 51 orbit 51 celestial object 51 On Orbit Status 51 geostationary orbit 51 Comet Tempel 1 51 Halley Comet 51 west longitude 51 Milky Way Galaxy 51 pad #A 51 Earth orbit 50 Lunar Eclipse 50 New Horizons spacecraft 50 orbiting 50 polar orbit 50 Aquarius Jan. 50 geomagnetic field 50 infrared wavelengths 50 extrasolar planet 50 Perseid meteor shower 50 moon Charon 50 redshift 49 Leonids 49 Eta Carinae 49 Gliese #g 49 planet orbiting 49 Saturn moon Enceladus 49 partial eclipse 49 Andromeda galaxy 49 nerzog 49 galaxy cluster 49 Earth magnetosphere 49 Itokawa 49 unaided eye 49 Solar System 49 solstice 49 lunar poles 49 outer planets 49 troposphere 49 winter solstice 49 #:#:# UTC 49 comet Hartley 2 49 MESSENGER 49 lunar orbit 49 moon Titan 49 heliosphere 49 Titan Saturn 49 UB# [003] 49 Scorpio Oct. 49 Betelgeuse 48 comet 48 asteroid belt 48 field Infrared Survey 48 Projected completion 48 Iapetus 48 Pleiades 48 substorms 48 interstellar space 48 flyby 48 habitable planet 48 super Earths 48 Libra Sept. 48 Crab Nebula 48 exoplanet