Related by context. Frequent words. (Click for all words.) 59 supermassive black holes 59 active galactic nuclei 56 galaxy formation 55 Hawking radiation 54 galaxies 54 stellar nurseries 53 globular clusters 53 Solar flares 53 tournament #.#/# 53 galaxy clusters 53 neutron stars 53 quasars 52 accretion disk 52 Gamma ray bursts 52 neutron star 52 gravitationally 52 Antarctic ozone 51 Cosmic rays 51 colliding galaxies 51 supermassive black hole 51 supernova explosions 51 dwarf galaxy 51 singularities 51 accreting 51 Earthlike 50 Andromeda galaxy 50 dwarf galaxies 50 Milky Way Galaxy 50 supernova explosion 50 magnetars 50 galaxy 50 supernovas 49 globular cluster 49 planetary nebulae 49 galaxy NGC 49 X ray Observatory 49 distant galaxies 49 WASP #b 48 protoplanetary disk 48 gravitational waves 48 quasar 48 supernova remnants 48 planets 48 super Earths 48 outer crust 48 protostar 48 spacetime 48 distant galaxy 48 R#a# 47 rocky planets 47 hot Jupiters 47 supernovae 47 holes 47 Milky Way galaxy 47 nebulas 47 Cosmologists 47 supercontinent 47 habitable planets 47 brown dwarfs 46 gravitational pull 46 moonlets 46 magnetar 46 Supernovae 46 WIMPs 46 Oort Cloud 46 astrophysical 46 Saturn moons 46 subatomic particle 46 Milky Way 46 galaxy cluster 46 optical telescopes 46 elliptical galaxies 46 Kuiper belt 45 lava tubes 45 Kuiper Belt objects 45 Astrophysicists 45 torus 45 nebulae 45 plutons 45 radial velocity 45 meteoroids 45 asteroids 45 Carina Nebula 45 Earth ozone layer 45 suns 45 undersea volcanoes 45 Gamma rays 45 magnetosphere 45 terrestrial planets 45 quantum gravity 45 planetesimals 44 Dust mites 44 potentially habitable 44 clasts 44 magnetic fields 44 habitable planet 44 GRBs 44 gaseous 44 ionized gas 44 subatomic 44 wormholes