Related by context. Frequent words. (Click for all words.) 70 brown dwarfs 68 rocky planets 66 planets 66 dwarf galaxies 66 exoplanets 66 brown dwarf 65 galaxies 64 extrasolar planets 62 neutron stars 62 supernovae 62 quasars 62 galaxy clusters 61 neutron star 61 planets orbiting 61 exoplanet 60 comets 59 quasar 59 gamma ray bursts 59 planet orbiting 58 nebulae 58 pulsars 57 distant galaxies 57 supermassive black holes 57 habitable zone 57 Milky Way galaxy 57 Sedna 56 orbits 56 galaxy 56 Milky Way 55 gamma ray burst 55 Kuiper Belt 55 supermassive black hole 54 supernovas 54 gaseous 54 distant galaxy 54 Gliese 54 pulsar 54 supernova 54 Saturn rings 53 atoms 53 nebula 53 Astronomers 53 neutrinos 53 filaments 53 nuclei 53 Betelgeuse 52 quarks 52 organic molecules 52 redshift 52 hydrogen atoms 52 positrons 52 astronomers 52 Uranus 51 asteroids 51 Enceladus 51 gravitational waves 51 cosmic microwave background 51 polycyclic aromatic hydrocarbons 51 celestial bodies 51 neutrino 51 magnetic fields 51 spiral galaxy 51 suns 50 magnetosphere 50 comet 50 atomic particles 50 Galaxies 50 Spitzer Space Telescope 50 subatomic particles 50 deuterium 50 vortices 50 moons 50 asteroid belt 50 moon Titan 49 solar flares 49 Perseids 49 Solar System 49 Iapetus 49 corona 49 gamma rays 49 planetary 49 buckyballs 49 neutrons 49 auroras 49 Saturn moon 49 dynamical 49 astrophysicists 49 cosmologists 48 quark 48 Pluto 48 heliosphere 48 meteorites 48 Earths 48 UB# [003] 47 sunspots 47 particles 47 orbiting 47 abundances 47 asteroid 47 cosmic dust 47 hydroxyl