Related by context. Frequent words. (Click for all words.) 53 distant galaxies 52 globular clusters 50 galaxies 50 astronomical objects 49 habitable planets 49 globular cluster 48 supernova explosions 47 brown dwarfs 47 extrasolar planets 47 cosmological 47 universe 47 galaxy 47 quasars 46 planets 46 nebulae 45 astrophysical 45 terrestrial planets 45 super Earths 45 GRBs 45 elliptical galaxies 45 supernovae 45 astrophysicists 45 Milky Way Galaxy 44 Milky Way galaxy 44 dwarf galaxies 44 galaxy clusters 44 cosmologists 43 supernovas 43 abundances 43 astronomers 43 Astronomers 43 distant galaxy 43 WIMPs 43 astronomical observations 43 Saturn rings 43 supermassive black holes 43 Andromeda galaxy 43 pulsars 42 neutron stars 42 spectroscopic 42 celestial bodies 42 rocky planets 42 morphologies 42 Solar System 42 exoplanets 42 supernova explosion 42 hot Jupiters 42 planets orbiting 42 ringed planet 41 astrobiologists 41 redshift 41 celestial objects 41 dwarf galaxy 41 infrared wavelengths 41 Milky Way 41 epochs 41 Galaxies 41 Neutrinos 41 universes 41 gravitational wave 41 cosmic microwave background 41 supersymmetry 40 subatomic 40 gamma ray bursts 40 Spitzer Space Telescope 40 cosmos 40 Big Bang 40 vortexes 40 outer planets 40 planetary 40 high temperature superconductivity 40 moon Europa 40 brown dwarf 40 single celled organisms 40 particle physicists 40 comets 40 supernova remnant 40 interstellar dust 40 auroral 39 habitable planet 39 Orion Nebula 39 WMAP 39 Planck 39 optical telescopes 39 X ray Observatory 39 gravitational waves 39 galactic 39 supernova 39 astronomical 39 geologic 39 Kuiper Belt 39 substorms 39 coronal mass ejections 39 Jupiter Saturn Uranus 39 extrasolar planet 39 Jupiter moons 38 earths 38 asteroid belt 38 craters 38 fossils 38 quark gluon plasma