Related by context. Frequent words. (Click for all words.) 60 spiral galaxy 55 colliding galaxies 54 Andromeda Galaxy 54 Andromeda galaxy 53 distant galaxy 52 Orion Nebula 51 X ray telescope 51 planetary nebula 50 Crab Nebula 50 planet Uranus 50 nebula 50 supernova remnants 50 spiral galaxies 49 constellation Orion 49 starburst 49 gamma ray burst 49 HD #b [002] 49 supernova remnant 49 constellation Leo 49 planet orbits 49 interplanetary spacecraft 49 spacecraft orbiting 49 dwarf galaxy 49 interferometers 48 galaxy cluster 48 Eta Carinae 48 planetary nebulae 48 polar vortex 48 galaxy 48 distant galaxies 48 Cancri 48 Galileo spacecraft 48 orbiting 47 Milky Way Galaxy 47 Voyager spacecraft 47 Earth magnetosphere 47 supernova explosion 47 Large Magellanic Cloud 47 Betelgeuse 47 ringed planet 47 magnetars 46 GRB # 46 Jupiter Saturn 46 constellation Perseus 46 Milky Way galaxy 46 galaxies 46 Spitzer Space Telescope 46 Space Telescope 46 Suzaku 46 X ray Observatory 46 HiRISE camera 46 Valles Marineris 45 Solar System 45 La Silla Chile 45 celestial object 45 Cassiopeia 45 interferometer 45 NASA Chandra 45 Mauna Kea Hawaii 45 nebulae 45 supernova explosions 45 accretion disk 45 X ray emission 45 globular cluster 45 quasar 44 Haumea 44 WASP #b 44 planetoid 44 active galactic nuclei 44 tiger stripes 44 comet tail 44 Fomalhaut 44 brown dwarf 44 Galaxy Evolution 44 boomerang shaped 44 Nebula 44 optical wavelengths 44 Pulsars 44 neutron stars 44 solar corona 44 Saturn moons 44 neutron star 44 star Gliese 44 XMM Newton 44 optical telescope 44 NASA Cassini 44 spacecrafts 44 VLBA 44 filaments 44 Kuiper belt 44 WMAP 44 gamma ray bursts 44 galaxy clusters 43 vortices 43 Iapetus 43 planets 43 reddish hue 43 torus 43 Saturn rings 43 constellations 43 Milky Way