Related by context. Frequent words. (Click for all words.) 70 ecliptic 63 Andromeda galaxy 62 Milky Way Galaxy 62 ringed planet 61 constellation Leo 60 ellipse 60 constellation Perseus 58 heliosphere 58 Andromeda Galaxy 58 galaxy cluster 57 umbra 57 distant galaxy 57 Earth magnetosphere 57 celestial object 57 Kuiper belt 57 Crab Nebula 57 occultation 56 Orion Nebula 56 Saturn rings 56 infrared wavelengths 56 celestial 56 COROT 56 spiral galaxy 56 planets 55 Milky Way galaxy 55 cosmos 55 spacetime 55 galaxy 55 HD #b [002] 55 comet nucleus 55 extrasolar planet 55 equinoxes 55 celestial bodies 55 nebula 55 supernova remnant 55 perigee 54 orbits 54 planetary 54 Uranus 54 outer planets 54 Mimas 54 accretion disk 54 X ray emission 54 Milky Way 54 constellations 54 Betelgeuse 54 magnetosphere 54 Lutetia 54 astronomical objects 53 auroral 53 sunspot 53 unaided eye 53 Comet Tempel 1 53 comet 53 elliptical orbit 53 orb 53 galactic 53 moon Charon 53 XMM Newton 53 parabola 53 extrasolar planets 53 NASA Cassini spacecraft 52 universe 52 celestial objects 52 distant galaxies 52 THEMIS 52 planets orbiting 52 planet orbiting 52 aurora 52 torus 52 Sedna 52 cosmic microwave background 52 Cassiopeia 52 Scorpius 52 Eta Carinae 52 ionized gas 52 equator 52 magnetar 52 ionosphere 52 rock outcrop 52 corona 51 moonrise 51 Jupiter moons 51 Solar System 51 interferometry 51 Saturn moon Enceladus 51 galaxy formation 51 redshift 51 supermoon 51 Pleiades 51 Kuiper Belt 51 eyepiece 51 equinox 51 circular orbit 51 habitable planets 51 constellation 51 martian surface 51 interstellar dust 51 Iapetus 51 globular cluster 51 Halley Comet