Related by context. Frequent words. (Click for all words.) 64 globular cluster 61 galaxy formation 61 dwarf galaxy 61 neutron stars 61 elliptical galaxies 60 supermassive black holes 60 interstellar medium 59 neutron star 59 spiral galaxies 59 galaxies 59 gravitationally 59 galaxy clusters 58 accreting 58 spacetime 58 supernova explosions 58 globular clusters 58 X ray emission 57 brown dwarfs 57 dwarf galaxies 57 ionized gas 57 supernova explosion 57 supermassive black hole 57 dynamical 57 Kuiper belt 56 galaxy cluster 56 Andromeda Galaxy 56 distant galaxy 56 GRBs 56 quasar 55 galactic 55 quasars 55 Earth magnetosphere 55 galaxy 55 magnetar 55 ejecta 55 rocky planets 54 Eta Carinae 54 astrophysical 54 hot Jupiters 54 gravitational 54 terrestrial planets 54 nebulae 54 atomic nuclei 54 supernovae 53 nuclei 53 superfluid 53 Andromeda galaxy 53 GeV 53 vortexes 53 vortices 53 spiral galaxy 53 magnetosphere 53 starbursts 52 cosmological 52 distant galaxies 52 super Earths 52 Milky Way 52 Milky Way Galaxy 52 gamma ray burst 52 auroral 52 Milky Way galaxy 52 COROT 51 interstellar dust 51 quantum gravity 51 habitable planets 51 supernova 51 gravitational wave 51 gravitational waves 51 angular momentum 51 meteoroids 51 nebula 51 fermions 51 brown dwarf 51 earths 51 pulsar 51 redshift 50 silicates 50 supersymmetry 50 atomic nucleus 50 planetary 50 astrophysicists 50 habitable planet 50 subatomic 50 WIMPs 50 gamma ray bursts 50 HD #b [002] 50 cosmic rays 50 Saturn moons 50 lithosphere 50 subatomic particles 50 ecliptic 50 Galaxies 50 XMM Newton 50 X ray Observatory 50 atoms 50 Large Magellanic Cloud 50 Orion Nebula 49 interstellar 49 GRB 49 neutrino 49 carbonaceous