Related by context. Frequent words. (Click for all words.) 62 supernova explosion 61 X ray emission 60 auroral 59 planet orbits 59 observable universe 59 visible wavelengths 59 planets orbiting 59 Gamma ray bursts 59 magnetar 59 astrophysical 58 supernova explosions 58 XMM Newton 58 GeV 57 GRBs 57 Orion Nebula 57 ringed planet 57 Eta Carinae 57 Milky Way Galaxy 56 Crab Nebula 56 gamma rays 56 constellation Leo 56 accretion disk 56 cosmic ray 56 ionized gas 56 distant galaxy 56 cosmic rays 56 astronomical objects 56 Andromeda Galaxy 55 supernovas 55 Large Magellanic Cloud 55 spiral galaxies 55 neutrinos 55 galaxy cluster 55 COROT 55 ejecta 55 galaxy 55 Fomalhaut 55 supernova remnant 55 globular cluster 55 planets 55 Andromeda galaxy 55 gamma ray burst 55 extrasolar planets 54 outer planets 54 comet nucleus 54 nebulae 54 HD #b [002] 54 planet orbiting 54 quasar 54 elliptical galaxies 54 spiral galaxy 54 dwarf galaxy 54 distant galaxies 54 WIMPs 54 infrared wavelengths 54 nebula 54 orbiting 53 orbits 53 celestial objects 53 starbursts 53 habitable planets 53 impactor 53 gamma ray bursts 53 coronal mass ejections 53 substorms 53 electron volts 52 Betelgeuse 52 supernova 52 constellation Perseus 52 Earth asteroids 52 solar nebula 52 microlensing 52 quasars 52 exoplanets 52 supernovae 52 globular clusters 52 Milky Way galaxy 52 redshift 52 gamma ray 52 muons 52 Kuiper belt 51 Jupiter Saturn 51 particle collisions 51 celestial object 51 magnetosphere 51 neutrino 51 auroras 51 interstellar dust 51 solar flares 51 subatomic particles 51 earths 51 positrons 51 wavelengths 51 Earth magnetosphere 51 comet 51 supermassive black hole 51 super Earths 51 Enceladus 51 coronal mass ejection 51 brown dwarfs 51 ecliptic