Related by context. Frequent words. (Click for all words.) 74 distant galaxies 73 galaxies 73 galaxy 71 Milky Way galaxy 69 supernova 68 gamma ray burst 67 quasar 67 Milky Way 67 quasars 67 nebula 66 supermassive black hole 66 brown dwarf 66 dwarf galaxies 66 redshift 65 neutron star 65 supernovae 65 planets 65 gamma ray bursts 65 planet orbiting 64 exoplanets 64 planets orbiting 64 comet 64 astronomers 63 extrasolar planets 63 exoplanet 63 neutron stars 63 brown dwarfs 62 galaxy clusters 62 rocky planets 62 pulsar 61 Spitzer Space Telescope 60 infrared wavelengths 60 supermassive black holes 60 supernovas 60 Solar System 59 gamma rays 59 pulsars 59 Sedna 59 galactic 59 gravitational waves 58 orbits 58 asteroid 58 Saturn rings 58 neutrinos 58 comets 58 nebulae 57 orbiting 57 fainter 57 NASA Chandra 56 Iapetus 56 astrophysicists 56 cosmic rays 56 neutrino 55 asteroids 55 Very Large Telescope 55 Gliese 55 Astronomers 55 asteroid belt 54 celestial objects 54 Halley Comet 54 universe 54 starlight 54 meteor 53 cosmic ray 53 GRB 53 suns 53 Andromeda 53 Kuiper Belt 53 photons 53 Cassini 53 WMAP 53 telescope 53 celestial bodies 53 cosmic 53 Cassiopeia 53 Enceladus 53 Pleiades 53 Galaxies 53 telescopes 53 solar flares 53 aurora 53 Space Telescope 52 interstellar space 52 Uranus 52 sunspot 52 Einstein theory 52 moons 51 cosmologists 51 cosmic microwave background 51 auroras 51 infrared radiation 51 Cassini spacecraft 51 elliptical orbit 51 subatomic particles 51 meteors 51 cosmos 51 atoms 51 Saturn moon 51 Astrophysical Journal Letters 50 gamma ray 50 Chandra X ray