Related by context. Frequent words. (Click for all words.) 60 planetary nebulae 59 Saturn rings 58 GRBs 58 elliptical galaxies 58 redshifts 57 brown dwarfs 57 solar nebula 57 globular clusters 57 globular cluster 57 active galactic nuclei 57 astronomers 57 galaxy formation 56 supercontinent 56 redshift 56 Jupiter Saturn Uranus 56 Hubble observations 56 X ray emission 56 HD #b [002] 56 Gamma ray bursts 56 gravitational lensing 56 Hawking radiation 56 Haumea 56 hot Jupiters 56 quasars 55 ejecta 55 spherules 55 XMM Newton 55 astronomical observations 55 dwarf planets 55 Edwin Hubble 55 star Gliese 55 Type Ia supernovae 55 microlensing 55 planetary nebula 54 nebulae 54 super Earths 54 astrophysicists 54 interferometry 54 spiral galaxies 54 Lutetia 54 GRB # 54 Kuiper belt 54 shorter wavelengths 54 dwarf galaxies 54 optical telescopes 53 galaxy clusters 53 dwarf galaxy 53 Gliese #g 53 silicates 53 cosmologists 53 COROT 53 terrestrial planets 53 Crab Nebula 53 supernova explosions 53 auroral 53 supernova remnant 53 celestial bodies 53 meteoroids 53 cosmic microwave background 53 Jupiter Saturn 53 Eta Carinae 52 UB# [003] 52 WM Keck Observatory 52 quasar 52 singularities 52 Cosmic rays 52 brown dwarf 52 Voyager spacecraft 52 cuprates 52 Higgs particle 52 lava tubes 52 haloes 52 supernova explosion 52 Mauna Kea Hawaii 52 supernovae 52 magnetar 52 prokaryotes 52 ancients 52 pulsars 52 occultation 52 planet orbiting 52 astronomical objects 52 planets orbiting 52 Milky Way 52 morphologies 51 exoplanets 51 Milky Way Galaxy 51 olivine 51 galaxies 51 unaided eye 51 celestial objects 51 planets 51 Halley comet 51 Chicxulub 51 stromatolites 51 distant galaxy 51 comets 51 La Silla Chile 51 Andromeda Galaxy 51 Orion Nebula 51 supernova remnants