Related by context. Frequent words. (Click for all words.) 69 globular cluster 66 globular clusters 65 dwarf galaxy 65 dwarf galaxies 65 Kuiper belt 64 supernova explosions 64 Milky Way Galaxy 63 magnetar 63 X ray emission 62 supernova remnant 62 galaxy clusters 62 terrestrial planets 62 elliptical galaxies 61 interstellar medium 61 galaxy cluster 61 galaxy formation 61 galaxies 61 GRBs 61 Andromeda galaxy 61 Andromeda Galaxy 60 accretion disk 60 supernovae 60 XMM Newton 60 distant galaxy 60 supernova explosion 60 quasars 60 neutron stars 60 rocky planets 59 ejecta 59 galaxy 59 brown dwarfs 59 Orion Nebula 59 distant galaxies 59 hot Jupiters 59 Milky Way 58 super Earths 58 spiral galaxies 58 nebulae 58 redshift 58 Eta Carinae 58 quasar 58 infrared wavelengths 58 brown dwarf 58 astronomical objects 58 Milky Way galaxy 58 supernova 57 nebula 57 ionized gas 57 HD #b [002] 57 neutron star 57 habitable planets 57 supernovas 56 spectroscopic 56 gravitationally 56 astrophysical 56 silicates 56 gamma ray burst 56 planets 56 Large Magellanic Cloud 56 interstellar dust 56 supermassive black hole 56 supermassive black holes 56 spiral galaxy 56 planet orbiting 55 gamma ray bursts 55 WIMPs 55 Saturn rings 55 Solar System 55 auroral 55 X ray Observatory 55 planets orbiting 55 Mimas 55 pulsar 55 accreting 55 Earth magnetosphere 55 exoplanet 54 gravitational lensing 54 nuclei 54 heliosphere 54 pulsars 54 spacetime 54 extrasolar planets 54 spectra 54 Betelgeuse 54 magnetosphere 53 unaided eye 53 Spitzer Space Telescope 53 astronomers 53 quark gluon plasma 53 Galaxies 53 interstellar space 53 GeV 53 atomic nuclei 53 comet nucleus 53 olivine 53 gravitational wave 53 abundances 53 optical telescopes 53 extrasolar planet 52 meteoroids 52 exoplanets