Related by context. Frequent words. (Click for all words.) 63 astronomers 61 supernova remnant 60 celestial object 60 distant galaxy 60 quasar 60 HD #b [002] 59 Eta Carinae 59 X ray emission 58 magnetar 58 XMM Newton 58 Crab Nebula 58 spiral galaxy 58 supernova explosion 57 planet orbiting 57 accretion disk 57 dwarf galaxy 56 gravitational lensing 56 galaxy cluster 56 Andromeda galaxy 56 GRBs 56 globular cluster 55 nebula 55 constellation Leo 55 Kuiper belt 55 Orion Nebula 55 Andromeda Galaxy 55 auroral 55 Gliese #g 55 astrophysicists 55 planets orbiting 55 constellation Perseus 54 gravitational wave 54 COROT 54 gamma ray burst 54 quasars 54 astronomical objects 54 Fomalhaut 54 extrasolar planet 53 infrared telescope 53 globular clusters 53 ejecta 53 supermassive black hole 53 supernova 53 interferometry 53 spiral galaxies 53 galaxy formation 53 ionized gas 53 comet 52 brown dwarf 52 comet nucleus 52 Saturn rings 52 distant galaxies 52 infrared wavelengths 52 cosmic ray 52 Jupiter moons 52 supernovae 52 Betelgeuse 52 elliptical galaxies 52 habitable planets 52 Cassini imaging 52 Cassiopeia 52 Milky Way Galaxy 51 ringed planet 51 Mimas 51 brown dwarfs 51 torus 51 synchrotron radiation 51 supernova explosions 51 galaxies 51 astrophysical 51 unaided eye 51 celestial objects 51 interstellar dust 51 UB# [003] 51 Astronomers 51 gravitational waves 51 WM Keck Observatory 51 ESO Very Large Telescope 51 pulsar 51 ecliptic 50 gamma rays 50 aurora 50 dwarf galaxies 50 muon 50 nebulae 50 occultation 50 cosmic microwave background 50 astronomer 50 ESA Mars 50 Milky Way 50 particle beam 50 extrasolar planets 50 Large Magellanic Cloud 50 Kuiper Belt 50 Milky Way galaxy 50 galaxy clusters 50 astronomical observations 50 pulsars 50 redshift 50 Gliese 49 galaxy