Related by context. Frequent words. (Click for all words.) 66 magnetar 65 X ray emission 64 supernova remnant 63 distant galaxy 62 quasar 61 accretion disk 61 astronomers 60 galaxy clusters 60 galaxies 60 HD #b [002] 60 dwarf galaxy 59 supernova explosion 59 pulsars 59 nebula 59 distant galaxies 59 quasars 59 Orion Nebula 59 extrasolar planet 59 celestial object 58 globular cluster 58 gamma ray burst 58 Andromeda galaxy 58 nebulae 58 elliptical galaxies 58 planet orbiting 58 XMM Newton 58 galaxy cluster 58 brown dwarfs 58 GRBs 57 globular clusters 57 neutron star 57 Andromeda Galaxy 57 gamma rays 57 supernovae 57 gravitational lensing 57 Milky Way Galaxy 56 Eta Carinae 56 interferometry 56 cosmic microwave background 56 quark gluon plasma 56 Kuiper belt 56 dwarf galaxies 56 X ray Observatory 56 spacetime 56 Saturn rings 56 ionized gas 55 gamma ray bursts 55 supernova 55 galaxy formation 55 spiral galaxy 55 spiral galaxies 55 pulsar 55 neutron stars 55 interstellar dust 55 astronomical objects 55 torus 55 infrared telescope 54 Astronomers 54 Milky Way galaxy 54 NASA Chandra 54 extrasolar planets 54 supermassive black hole 54 planets orbiting 54 supernova explosions 54 cosmic ray 54 redshift 54 exoplanet 54 comet 54 gravitational wave 54 astrophysicists 53 Spitzer Space Telescope 53 brown dwarf 53 WM Keck Observatory 53 comet nucleus 53 IceCube 53 photonic crystal 53 neutrino 53 supernovas 53 interstellar medium 53 anisotropy 53 exoplanets 53 rocky planets 53 auroral 53 hot Jupiters 53 ejecta 53 spectroscopic 53 moon Charon 53 WIMPs 53 Very Large Array 53 planets 52 galaxy 52 Saturn moons 52 muon 52 Jupiter moons 52 heliosphere 52 ringed planet 52 gamma ray 52 gravitational waves 52 Large Magellanic Cloud 52 atomic nucleus 52 constellation Perseus