Related by context. Frequent words. (Click for all words.) 56 exoplanet 56 Planck 56 extrasolar planets 52 exoplanets 52 planets 50 planets orbiting 47 brown dwarf 47 rocky planets 47 quasar 47 telescope 46 astronomers 46 Cassini 46 Spitzer Space Telescope 46 quasars 46 Milky Way 46 brown dwarfs 46 Huygens 45 Hubble 45 spectroscopic 45 Herschel 45 gamma ray bursts 44 supernovae 44 pulsars 44 redshift 43 distant galaxies 43 comet 43 Solar System 43 Mars 43 LCROSS 43 Sedna 42 Enceladus 42 Gliese 42 habitable zone 42 celestial objects 42 astronomer 42 SETI Institute 42 Tarter 42 gamma ray burst 42 Milky Way galaxy 42 telescopes 41 spectrograph 41 supernova 41 planetary 41 pulsar 41 Pluto 41 Saturn rings 41 neutrino 41 MESSENGER 41 Astronomers 41 Astronomer 41 asteroid 41 astrophysicists 41 adaptive optics 40 galaxies 40 comets 40 Higgs 40 astrobiology 40 Asteroid 40 amateur astronomers 40 orbits 40 Mars Reconnaissance Orbiter 40 galaxy 40 LRO 40 observatory 39 asteroid belt 39 ESO 39 spectrometer 39 Higgs boson 39 infrared wavelengths 39 Hubble telescope 39 amateur astronomer 39 asteroids 39 NASA Chandra 39 astronomy 39 spectra 39 Kuiper Belt 39 cosmic microwave background 39 spectroscopy 39 Saturn moon 39 Cassini spacecraft 39 orbiting 39 supernovas 38 Eris 38 spectrometers 38 Lagrange 38 flyby 38 Earths 38 Telescope 38 Copernicus 38 Astrophysics 38 Mars Global Surveyor 38 dwarf planet 38 Rosetta 38 moons 38 Galaxies 38 neutrinos 38 Mars Odyssey 38 NASA Jet Propulsion Laboratory 38 SETI 38 universe 38 Charon