Related by context. Frequent words. (Click for all words.) 82 brown dwarf 73 rocky planets 73 galaxies 71 exoplanets 71 quasars 71 exoplanet 70 extrasolar planets 69 supernovae 68 dwarf galaxies 68 planets orbiting 68 planets 68 galaxy clusters 67 neutron stars 67 pulsars 66 redshift 66 neutron star 66 quasar 65 gamma ray bursts 65 distant galaxies 64 supermassive black holes 63 planet orbiting 63 nebulae 63 Milky Way galaxy 63 astronomers 63 supernova 62 supernovas 62 gamma ray burst 62 Gliese 61 Milky Way 61 habitable zone 61 pulsar 60 astrophysicists 60 supermassive black hole 59 comets 59 neutrinos 59 galaxy 58 neutrino 58 cosmic rays 58 Astronomers 58 nebula 58 Enceladus 58 Sedna 58 gamma rays 57 Kuiper Belt 57 orbits 56 cosmologists 56 Saturn rings 56 celestial objects 56 Spitzer Space Telescope 56 gravitational waves 55 cosmic microwave background 55 cosmic ray 55 Solar System 55 atoms 55 neutrons 55 deuterium 54 asteroids 54 organic molecules 54 nuclei 53 WMAP 53 general relativity 53 planetary 53 Galaxies 53 UB# [003] 53 infrared wavelengths 53 Earths 53 suns 53 dynamical 53 spectroscopic 52 atomic particles 52 magnetic fields 52 moons 52 Higgs boson 52 subatomic particles 52 corona 52 quarks 52 celestial bodies 51 fainter 51 orbiting 51 spectra 51 sunspots 51 hydrogen atoms 50 GRB 50 Pluto 50 NASA Chandra 50 Planck 50 magnetosphere 50 solar flares 50 meteorites 50 comet 50 superconductivity 50 infrared radiation 50 photons 49 asteroid 49 buckyballs 49 antimatter 49 cosmological 49 particles 49 luminosity 49 galactic 49 particle accelerators