Related by context. Frequent words. (Click for all words.) 45 redshift 45 SDSS 44 elliptical galaxies 43 A'Hearn 43 XMM Newton 43 astronomers 42 astronomer 42 brown dwarfs 41 Eta Carinae 41 extrasolar planets 41 quasar 40 Kepler 40 spectroscopic 39 GRBs 39 planets 39 supernovae 39 JWST 39 exoplanet 39 infrared wavelengths 39 astrophysical 39 extrasolar planet 39 Lowell Observatory 39 globular clusters 39 galaxies 39 adaptive optics 38 terrestrial planets 38 quasars 38 pulsars 38 Planck 38 dwarf galaxy 38 NASA Goddard 38 supernova 38 HD #b [002] 37 Solar System 37 exoplanets 37 nebulae 37 Saturn rings 37 WM Keck Observatory 37 distant galaxy 37 astronomy 36 Orion Nebula 36 astrophysicists 36 Borucki 36 brown dwarf 36 planets orbiting 36 gamma ray bursts 36 Tarter 36 Milky Way Galaxy 35 Astronomer 35 supernovas 35 Crater 35 cosmic microwave background 35 Astrophysics 35 comet nucleus 35 galaxy cluster 35 interferometer 35 celestial objects 35 HiRISE 35 orbits 35 Spitzer Space Telescope 35 spiral galaxies 35 gamma ray burst 35 Betelgeuse 34 Charon 34 X ray Observatory 34 WMAP 34 galaxy 34 distant galaxies 34 rocky planets 34 Space Telescope 34 Tombaugh 34 Johannes Kepler 34 supernova explosion 33 unaided eye 33 Milky Way galaxy 33 Hubble 33 spectroscopy 33 Herschel 33 spectra 33 telescope 33 planet orbiting 32 pulsar 32 super Earths 32 THEMIS 32 optical telescopes 32 ESO 32 Trosper 32 cosmologists 32 MESSENGER 32 Vallivue 32 Pusch Ridge 32 NASA Chandra 32 telescopes 32 Astronomers 32 neutrino 32 Milky Way 32 Saturn moons 31 Lutetia 31 Cassini 31 Brahe 31 interstellar dust