Related by context. Frequent words. (Click for all words.) 68 galaxy NGC 65 solar corona 65 planetary nebula 64 planetary nebulae 63 Eta Carinae 63 WASP #b 63 Andromeda galaxy 62 Orion Nebula 62 Carina Nebula 61 distant galaxy 61 Crab Nebula 61 X ray emission 61 supernova explosion 61 nebulae 60 HD #b [002] 60 planet orbits 60 Gamma ray bursts 60 noctilucent clouds 60 planet Uranus 60 ultraviolet wavelengths 60 protoplanetary disk 59 Galileo spacecraft 59 photometer 59 Betelgeuse 59 protostar 59 supernova explosions 59 Earthlike 59 active galactic nuclei 59 XMM Newton 59 supernova remnant 58 SIRTF 58 galaxy cluster 58 celestial object 58 constellation Gemini 58 brown dwarf 58 magnetar 58 Saturn moon Enceladus 58 unaided eye 58 Galaxy Evolution 58 Cancri 58 Kuiper belt 58 star Gliese 58 Hubble observations 58 innermost planet 58 nebula 58 planet orbiting 57 constellation Leo 57 Oort Cloud 57 globular cluster 57 Cepheids 57 aurorae 57 distant galaxies 57 solar nebula 57 Milky Way Galaxy 57 Olympus Mons 57 Gamma rays 57 Supernovae 57 Comet McNaught 57 Saturn rings 57 magnetars 56 constellation Perseus 56 Andromeda Galaxy 56 polar vortex 56 Large Magellanic Cloud 56 mesosphere 56 NASA ESA Hubble 56 colliding galaxies 56 Spitzer Space Telescope 56 Mimas 56 perihelion 56 dwarf galaxy 56 rocky planets 56 near infrared NIR 56 infrared wavelengths 56 ionised 56 spiral galaxy 56 Solar flares 55 shorter wavelengths 55 GRB # 55 globular clusters 55 quasar 55 HiRISE camera 55 NASA Stardust spacecraft 55 constellation Orion 55 moonlets 55 super Earths 55 galaxy formation 55 Halley comet 55 ionized gas 55 La Silla Chile 55 visible wavelengths 55 NASA Cassini spacecraft 55 cosmic microwave background 55 supernova remnants 55 elliptical galaxies 55 planets orbiting 55 Ultraviolet radiation 55 comet tail 55 interplanetary spacecraft 55 Martian equator 55 moon Europa