Related by context. Frequent words. (Click for all words.) 69 brown dwarfs 69 elliptical galaxies 69 globular clusters 68 galaxies 67 quasars 67 rocky planets 67 dwarf galaxies 66 terrestrial planets 65 nebulae 64 planets 64 distant galaxies 63 galaxy clusters 63 supernova explosion 63 extrasolar planets 63 comets 62 interstellar dust 62 supernovae 62 nebula 62 interstellar medium 62 neutron stars 62 Milky Way galaxy 62 brown dwarf 61 Milky Way Galaxy 61 distant galaxy 60 Milky Way 60 supermassive black holes 60 spiral galaxies 60 planet orbiting 60 Saturn rings 59 galaxy cluster 59 planets orbiting 59 galaxy 58 supernovas 58 abundances 58 neutron star 58 exoplanet 58 supermassive black hole 58 quasar 58 cosmic rays 58 exoplanets 58 XMM Newton 57 infrared wavelengths 57 astronomers 57 astrophysicists 57 supernova 57 astrophysical 57 organic molecules 57 pulsars 57 magnetic fields 57 HD #b [002] 56 Solar System 56 Spitzer Space Telescope 56 gamma rays 55 X ray Observatory 55 gamma ray bursts 55 redshift 55 magnetosphere 55 Enceladus 55 Iapetus 54 gravitational lensing 54 moons 54 olivine 54 Saturn moons 54 nuclei 54 Kuiper Belt 54 WMAP 54 cosmic microwave background 54 cosmic dust 53 spectroscopic 53 gamma ray burst 53 comet 53 pulsar 53 Astronomers 53 mid latitudes 53 corona 53 vortices 53 convective 52 spiral galaxy 52 outer planets 52 cometary 52 extrasolar planet 52 craters 52 NASA Chandra 52 gravitational waves 52 filaments 52 orbits 52 celestial bodies 52 asteroids 52 unaided eye 51 dust particles 51 heliosphere 51 dust devils 51 radioactive decay 51 cosmic ray 51 ultraviolet radiation 51 particles 51 Betelgeuse 51 cosmologists 51 sunspots 51 celestial objects 51 dynamical