Related by context. Frequent words. (Click for all words.) 75 pulsar 73 supernovae 72 neutron stars 70 galaxies 70 gamma ray bursts 70 quasars 69 supernovas 68 neutron star 67 brown dwarfs 66 extrasolar planets 66 supernova 66 galaxy clusters 65 exoplanets 65 quasar 65 distant galaxies 64 gamma ray burst 64 supermassive black holes 63 exoplanet 62 astronomers 62 planets 61 supermassive black hole 60 gravitational waves 60 Milky Way galaxy 59 nebula 59 planets orbiting 58 redshift 58 brown dwarf 57 Milky Way 57 galaxy 56 magnetic fields 56 Saturn rings 56 gamma rays 55 auroras 55 cosmic rays 55 comets 55 subatomic particles 55 neutrino 54 celestial objects 54 astrophysicists 54 Astronomers 54 fainter 54 gamma ray 54 orbits 53 neutrinos 53 solar flares 53 Solar System 52 Sedna 52 asteroids 52 Gliese 51 celestial bodies 51 Spitzer Space Telescope 51 nuclei 51 meteorites 51 sunspots 51 neutrons 51 cosmological 50 photons 50 atoms 50 comet 50 oscillations 50 Higgs boson 49 aurora 49 infrared wavelengths 49 GRB 49 spectra 49 general relativity 49 Kuiper Belt 49 sunspot 49 Galaxies 49 astronomer 48 telescopes 48 protons 48 planetary 48 vortices 48 wavelengths 48 photon 48 meteors 48 organic molecules 47 cosmology 47 Astrophysical Journal 47 spectrograph 47 filaments 47 Earths 47 moons 47 asteroid belt 47 spectroscopy 47 deuterium 47 quarks 47 magnetosphere 46 electrons 46 corona 46 Planck 46 particles 46 telescope 46 electron 46 antimatter 46 astronomy 46 asteroid 46 Enceladus 46 luminosity 46 quantum mechanical