Related by context. Frequent words. (Click for all words.) 56 planets 53 distant galaxy 53 galaxies 53 nebulae 53 quasar 53 brown dwarfs 52 Milky Way 52 nebula 52 sun 52 quasars 51 supermassive black holes 51 Milky Way galaxy 50 supermassive black hole 50 brown dwarf 50 galaxy clusters 50 supernova 50 Betelgeuse 50 galaxy 50 neutron star 49 neutron stars 49 supernovae 49 gamma rays 49 supernovas 49 luminosity 49 dwarf galaxies 49 rocky planets 48 fainter 48 orbits 48 planets orbiting 48 corona 48 rays 48 Gliese 48 moons 47 extrasolar planets 47 meteors 46 positrons 46 distant galaxies 46 planet orbiting 46 spiral galaxy 46 exoplanets 45 pulsars 45 ringed planet 45 megatons 45 neutrinos 45 celestial objects 45 comets 44 redshift 44 nuclei 44 gamma ray burst 44 luminous 44 Earths 44 atoms 43 filaments 43 Perseids 43 gamma ray bursts 43 comet 43 neutrons 43 galactic 43 atomic particles 43 vortices 43 magnetic fields 43 laser beams 43 nova 43 Pleiades 42 interstellar space 42 orb 42 gravitational pull 42 cosmos 42 Saturn rings 42 spherical 42 Uranus 42 pulsar 42 starburst 42 Sedna 42 blobs 42 outer layers 42 hydrogen atoms 42 watt light bulb 42 brightness 41 starlight 41 cosmic 41 celestial bodies 41 orbiting 41 equator 41 planet 41 astrophysicists 41 heliosphere 41 molten 41 cosmic rays 41 Ganymede 41 astronomers 40 Pluto 40 asteroids 40 meteor shower 40 halos 40 XMM Newton 40 aurora 40 ultraviolet light 40 infrared wavelengths 40 universe 40 constellations