Related by context. Frequent words. (Click for all words.) 69 supernovae 69 supernova 69 supernova explosion 67 galaxies 67 neutron stars 66 globular clusters 66 galaxy clusters 66 pulsars 65 quasars 65 pulsar 65 supernovas 64 elliptical galaxies 64 distant galaxy 64 neutron star 63 nebula 63 brown dwarfs 63 supermassive black holes 63 galaxy cluster 63 distant galaxies 62 Milky Way galaxy 62 quasar 62 spiral galaxies 62 nebulae 61 spiral galaxy 61 gamma ray burst 60 gamma ray bursts 60 redshift 60 dwarf galaxies 60 supermassive black hole 59 Milky Way Galaxy 59 Milky Way 59 galaxy 58 brown dwarf 58 terrestrial planets 58 X ray Observatory 58 rocky planets 57 Saturn rings 57 positrons 57 cosmic rays 57 extrasolar planets 57 planets 56 XMM Newton 56 NASA Chandra 56 interstellar medium 56 HD #b [002] 56 exoplanets 56 gravitational waves 56 nuclei 55 atomic nuclei 55 WMAP 55 gamma rays 54 cosmic microwave background 54 corona 54 Spitzer Space Telescope 54 astronomers 54 gravitational lensing 54 interstellar dust 54 filaments 54 planet orbiting 54 magnetic fields 54 Betelgeuse 54 infrared wavelengths 53 spacetime 53 planets orbiting 53 neutrinos 53 Solar System 53 Cassiopeia 52 cosmologists 52 radioactive decay 52 neutrino 52 comets 52 astrophysical 52 comet 52 magnetosphere 52 astrophysicists 51 heliosphere 51 subatomic particles 51 Enceladus 51 suns 51 superfluid 51 ringed planet 51 high temperature superconductors 51 cosmological 51 abundances 51 cometary 51 cosmic ray 51 spectra 51 starburst 50 Astronomers 50 CMEs 50 luminosity 50 exoplanet 50 Galaxies 50 sunspot 50 vortices 50 neutrons 50 auroras 50 atoms 49 Kuiper Belt 49 Saturn moons 49 solar flares