Related by context. Frequent words. (Click for all words.) 73 galaxies 73 Milky Way 71 galaxy 70 supernova 69 Milky Way galaxy 68 quasar 67 neutron star 66 supermassive black hole 66 distant galaxies 65 supernovae 65 quasars 63 pulsar 63 galaxy clusters 62 brown dwarf 62 gamma ray burst 61 supermassive black holes 61 planets 61 Saturn rings 61 neutron stars 60 supernovas 59 gamma ray bursts 59 Enceladus 59 corona 59 pulsars 59 exoplanets 58 gamma rays 58 brown dwarfs 58 comet 58 Kuiper Belt 57 astronomers 57 extrasolar planets 57 Spitzer Space Telescope 57 planets orbiting 56 filaments 56 Solar System 56 comets 56 Sedna 56 aurora 56 exoplanet 55 vortices 55 infrared wavelengths 55 moons 55 magnetosphere 54 nuclei 54 magnetic fields 54 starlight 54 Pleiades 54 fainter 53 orbits 53 Astronomers 53 constellation 53 cosmos 53 luminosity 53 atoms 52 universe 52 starburst 52 suns 52 cosmic rays 52 asteroid belt 52 sunspots 52 Uranus 52 sunspot 51 Andromeda 51 auroras 51 outer layers 51 interstellar space 50 astrophysicists 50 infrared radiation 50 celestial objects 50 galactic 50 particles 50 NGC 50 gravitational waves 49 Galaxies 49 gamma ray 49 spectra 49 Nebula 49 neutrino 49 constellations 49 solar flares 49 orb 49 bluish 48 neutrons 48 volcanism 48 GRB 48 asteroids 48 gravitational 48 Gliese 48 ionized 48 organic molecules 48 orbiting 48 cosmic 47 neutrinos 47 wavelengths 47 Big Bang 47 hydrogen atoms 47 celestial bodies 47 spherical 47 gaseous 47 Saturn 47 Saturn moon