Related by context. Frequent words. (Click for all words.) 54 globular cluster 54 Andromeda galaxy 53 globular clusters 52 elliptical galaxies 52 galaxies 51 quasars 50 dwarf galaxy 50 magnetar 50 supernova explosion 49 galaxy cluster 49 distant galaxy 48 supernova explosions 48 supernova remnant 48 spiral galaxy 47 Milky Way galaxy 47 spiral galaxies 47 nebulae 47 nebula 47 distant galaxies 47 Eta Carinae 46 brown dwarfs 46 supernovae 46 planet orbiting 46 HD #b [002] 46 redshift 46 Milky Way 46 supernova 46 galaxy 45 single celled organisms 45 galaxy clusters 45 Orion Nebula 45 neutron stars 45 quasar 45 X ray emission 45 GRBs 45 pulsars 45 cosmologists 45 Milky Way Galaxy 45 universe 45 dwarf galaxies 44 hot Jupiters 44 pulsar 44 cosmic microwave background 44 celestial object 44 clusters 44 rocky planets 44 supermassive black hole 44 gamma ray burst 43 supermassive black holes 43 habitable planets 43 neutron star 43 interstellar dust 43 terrestrial planets 43 optical telescopes 43 comet nucleus 43 astronomers 43 Andromeda Galaxy 43 brown dwarf 43 subatomic particles 42 gamma ray bursts 42 supernovas 42 Kuiper Belt 42 gamma rays 42 coronal mass ejection 42 atomic particles 42 super Earths 42 XMM Newton 42 cosmic dust 41 constellation Leo 41 X ray Observatory 41 astronomical objects 41 gravitational waves 41 accreting 41 cosmos 41 exoplanets 41 quark gluon plasma 41 nuclei 41 Betelgeuse 41 comet Wild 41 Astronomers 41 WIMPs 41 muons 41 gravitationally 41 unaided eye 40 single celled 40 cosmic rays 40 infrared wavelengths 40 starbursts 40 cosmological 40 Neutrinos 40 astrophysicists 40 blobs 40 cluster 40 Saturn moons 40 planets 40 positrons 40 GeV 39 ringed planet 39 extrasolar planet 39 cigar shaped 39 Earth magnetosphere