Related by context. Frequent words. (Click for all words.) 66 accretion disk 66 X ray emission 62 planetary nebulae 62 ionized gas 62 supermassive black hole 61 dwarf galaxy 61 globular cluster 60 galaxy clusters 60 GRBs 59 galaxy cluster 59 quasar 59 supernova explosion 59 magnetar 59 supernova remnant 58 GRB # 58 accreting 58 galaxy formation 58 supernova remnants 58 distant galaxy 58 Andromeda galaxy 58 supernova explosions 57 neutron star 57 torus 57 Eta Carinae 57 quasars 57 galaxies 57 planetary nebula 57 Kuiper belt 57 elliptical galaxies 57 Andromeda Galaxy 57 gamma rays 57 dwarf galaxies 57 spiral galaxies 57 auroral 57 supermassive black holes 56 HD #b [002] 56 Milky Way Galaxy 56 gamma ray bursts 56 Gamma ray bursts 56 gravitational waves 56 nebulae 56 brown dwarfs 55 AGN 55 neutron stars 55 nebula 55 astrophysical 55 Earth magnetosphere 55 gamma ray burst 55 globular clusters 55 spiral galaxy 55 gravitationally 55 Type Ia supernovae 55 Milky Way galaxy 55 spacetime 54 magnetic fields 54 Large Magellanic Cloud 54 XMM Newton 54 Crab Nebula 54 distant galaxies 54 terrestrial planets 54 constellation Perseus 54 interstellar medium 54 gravitational lensing 54 brown dwarf 54 optical telescopes 54 supernovae 53 Cancri 53 constellation Leo 53 solar nebula 53 hot Jupiters 53 galaxy 53 ecliptic 53 Hubble observations 53 aerosol particles 53 pulsars 53 ejecta 53 X ray Observatory 53 gravitational wave 53 magnetosphere 53 rocky planets 52 olivine 52 interferometry 52 astronomical objects 52 WIMPs 52 planets orbiting 52 planet orbiting 52 vortices 52 planet orbits 52 Haumea 52 cosmic ray 52 coronal mass ejection 52 Orion Nebula 52 exciton 52 positrons 52 extrasolar planet 51 nuclei 51 Enceladus 51 Galaxy Evolution 51 CMEs 51 toroidal 51 silicates