Related by context. Frequent words. (Click for all words.) 61 redshift 58 z = 55 Crab Nebula 54 distant galaxy 54 Cancri 54 observable universe 53 globular cluster 53 Andromeda galaxy 52 magnetar 52 planetary nebulae 52 supernova remnants 51 globular clusters 51 GeV 51 planetary nebula 51 Type Ia supernovae 51 supernova remnant 51 galaxy cluster 51 COROT 51 Gamma ray bursts 51 super Earths 50 XMM Newton 50 dwarf galaxy 50 Orion Nebula 50 planet orbits 50 anisotropy 50 quasars 50 GRB # 49 Galaxy Evolution 49 MeV 49 Fomalhaut 49 Gliese #g 49 HD #b [002] 49 Milky Way Galaxy 49 Andromeda Galaxy 49 extrasolar planet 48 Algol 48 visible wavelengths 48 extrasolar planets 48 brown dwarfs 48 spatial dimensions 48 GPa 48 Hubble observations 48 planets orbiting 48 OGLE 48 GRBs 47 brown dwarf 47 NICMOS 47 picoseconds 47 microlensing 47 gravitational wave 47 Large Magellanic Cloud 47 Supplementary Fig 47 photometric 47 WIMPs 47 planet orbiting 47 X ray emission 47 exoplanets 46 elliptical galaxies 46 supernovae 46 supernova explosion 46 spectroscopic 46 Eta Carinae 46 Fig. 46 quasar 46 Betelgeuse 46 spectra 46 femtoseconds 46 Alpha Centauri 46 sextillion 46 solar nebula 46 cosmic microwave background 46 unaided eye 45 galaxy formation 45 habitable planets 45 fainter 45 distant galaxies 45 infrared wavelengths 45 Kuiper belt 45 exoplanet 45 angstroms 45 Pulsars 45 Milky Way galaxy 45 auroral 45 Halley comet 45 micrometres 45 supernova 45 WMAP 45 unobservable 45 Gliese 45 Uranus 45 Venusian 45 galaxy 44 planets 44 orbits 44 cosmological 44 occultation 44 orbiting Saturn 44 amplitudes 44 electron volts 44 galaxy clusters 44 solar corona