Related by context. Frequent words. (Click for all words.) 64 constellation Leo 62 moonrise 61 perigee 61 ringed planet 61 Geminids 60 constellation Perseus 59 constellation Orion 59 rover Opportunity 59 occultation 59 Andromeda Galaxy 59 Jupiter Saturn 59 supermoon 58 Lunar Eclipse 58 planet orbits 58 ecliptic 58 Saturn moon Enceladus 58 Perseid meteor shower 58 circular orbit 57 unaided eye 57 infrared wavelengths 57 Saturn rings 57 Opportunity rover 57 Eta Carinae 57 partial lunar eclipse 56 NASA Cassini spacecraft 56 X ray emission 56 Fomalhaut 56 distant galaxy 56 HD #b [002] 56 sunspot cycle 56 XMM Newton 56 moon Charon 56 annular eclipse 55 equinox 55 Leonids 55 Crab Nebula 55 orbiting 55 skywatchers 55 comet nucleus 55 autumnal equinox 55 Betelgeuse 55 elliptical orbit 55 COROT 55 umbra 55 flyby 55 Perseids 54 accretion disk 54 spring equinox 54 NASA Aqua 54 moon 54 Andromeda galaxy 54 Saturn moon 54 orbiting observatory 54 Comet Tempel 1 53 auroras 53 lunar eclipse 53 comet 53 celestial object 53 orbiting telescope 53 Milky Way Galaxy 53 Cancri 53 Cabeus crater 53 total lunar eclipse 53 field Infrared Survey 53 vernal equinox 53 interstellar dust 53 spiral galaxy 53 Scorpius 53 geomagnetic field 53 orbits 53 Orion Nebula 52 gamma ray burst 52 telescope 52 orbit insertion 52 New Horizons spacecraft 52 extrasolar planet 52 Iapetus 52 Cassini orbiter 52 substorms 52 Earth magnetosphere 52 crescent moon 52 Palomar Observatory 52 meteoroids 52 Pleiades 52 Cassini 52 NASA Lunar Reconnaissance 52 Stardust spacecraft 52 galaxy cluster 52 equinoxes 52 moon Titan 52 ESO Very Large Telescope 52 sunspot numbers 52 comet Hartley 2 52 aurora 52 microlensing 51 nebulae 51 orbiting spacecraft 51 Mimas 51 comet Wild 51 partial eclipse 51 Victoria Crater