Related by context. Frequent words. (Click for all words.) 59 supernovas 58 Gamma ray bursts 56 supernova remnants 55 magnetar 55 planetary nebula 55 supernovae 54 Crab Nebula 54 planetary nebulae 53 meteoroid 53 meteoroids 53 supernova explosion 53 astrophysicists 53 supernova explosions 52 Astrophysicists 52 Type Ia supernovae 52 WIMPs 52 X ray emission 52 GRBs 52 distant galaxy 52 supernova 52 astrophysical 52 Eta Carinae 51 supernova remnant 51 cosmic 51 accreting 51 singularities 51 nebulae 51 planets circling 51 Andromeda galaxy 51 haloes 51 Saturn rings 50 galaxy formation 50 dwarf galaxy 50 cosmological 50 spherules 50 meteors 50 planet orbiting 50 astronomical objects 49 gamma ray burst 49 meteor showers 49 cosmic rays 49 Astrophysicist 49 comet 49 solar nebula 49 gamma ray bursts 49 starbursts 49 planets 49 meteor 49 subatomic particle 49 Leonids 49 nova 49 Betelgeuse 49 globular cluster 48 accretion disk 48 planetoid 48 habitable planets 48 gravitational wave 48 observable universe 48 galaxy 48 Pulsars 48 redshift 48 suns 48 quasar 48 neutron star 48 habitable planet 48 ejecta 48 GRB # 48 cosmologists 48 globular clusters 48 HD #b [002] 48 rocky planets 48 spacetime 48 cosmic ray 48 coronal mass ejection 48 asteroids 48 comets 47 brown dwarfs 47 dwarf galaxies 47 Orion Nebula 47 elliptical galaxies 47 Saturn moons 47 solar flares 47 shorter wavelengths 47 extrasolar planet 47 extrasolar planets 47 wormholes 47 Andromeda Galaxy 47 alien civilizations 47 galaxy cluster 47 Kuiper belt 47 brown dwarf 47 exoplanets 47 Phil Plait 47 Milky Way Galaxy 47 quasars 47 Geminids 47 terrestrial planets 47 sextillion 46 Halley comet 46 gamma rays 46 galaxies