Related by context. Frequent words. (Click for all words.) 62 Harvard Smithsonian 58 Astrophysics 57 Niels Bohr Institute 56 Astrophysicist 55 extrasolar planet 55 NASA Goddard 54 Lowell Observatory 54 Galaxy Evolution 54 Astrophysical Journal 54 Astrophysical Journal Letters 54 Type Ia supernovae 54 elliptical galaxies 54 GRBs 54 XMM Newton 53 astrophysical 53 planetary nebulae 53 Hubble observations 53 Smithsonian Astrophysical Observatory 52 Planetary Science 52 NASA Chandra 52 rocky planets 52 distant galaxy 52 astrophysicists 52 extrasolar planets 52 galaxy clusters 51 astronomers 51 terrestrial planets 51 Kavli Institute 51 Milky Way Galaxy 51 WIMPs 51 supernovae 51 Cassini imaging 51 celestial object 51 spectroscopic 51 LLNL 51 planetary scientist 51 journal Astronomy 51 microlensing 51 gravitational lensing 50 habitable planets 50 planet orbiting 50 habitable planet 50 astrophysicist 50 exoplanets 50 Saturn rings 50 planets orbiting 50 super Earths 50 LBNL 50 NRAO 50 X ray emission 50 Planetary Laboratory 50 distant galaxies 50 Max Planck Institute 50 WMAP 50 gravitational waves 50 numerical simulations 49 X ray telescope 49 IceCube 49 Spitzer Space Telescope 49 WM Keck Observatory 49 HD #b [002] 49 Eta Carinae 49 supermassive black hole 49 planets 49 interferometry 49 antiprotons 49 astronomer 49 positron 49 quark gluon plasma 49 auroral 49 ejecta 49 Andromeda Galaxy 49 X ray Observatory 49 galaxy formation 49 OGLE 49 cosmic ray 49 galaxies 48 Applied Physics Laboratory 48 meteoroid 48 muon 48 atmospheric chemistry 48 Spectrometer 48 quasar 48 Milky Way galaxy 48 galaxy cluster 48 NASA Goddard Space 48 HHMI investigator 48 LIGO 48 exoplanet 48 supersymmetry 48 COROT 48 Astrobiology 48 Lick Observatory 48 Iapetus 48 cosmic microwave background 48 redshift 48 cosmic rays 48 quasars 48 astronomical observations 48 Milky Way 48 astrobiologists