Related by context. Frequent words. (Click for all words.) 61 microlensing 56 WM Keck Observatory 56 Pan STARRS 55 NASA Kepler 54 Astrophysicists 54 astronomers 53 Keck Observatory 53 Cassini Huygens 52 XMM Newton 52 observatories 52 extrasolar planets 52 Remote sensing 51 Galaxy Evolution 51 astrophysicists 51 Gemini Observatory 51 particle physicists 51 optical telescopes 51 astronomical observations 51 COROT 51 HARPS 51 IceCube 51 infrared telescope 50 physicists 50 telescopes 50 ESO Very Large Telescope 49 THEMIS 49 gravitational wave 49 Arecibo Observatory 49 COBE 49 NASA Chandra 48 Hubble observations 48 Observatories 48 NASA JPL 48 Astronomers 48 Lick Observatory 48 theoretical physicists 48 interplanetary spacecraft 48 spacecraft orbiting 48 exoplanets 48 spectroscopic 48 OGLE 48 geophysicists 48 cosmologists 48 astronomer 47 Extraterrestrial Intelligence 47 extrasolar planet 47 Very Large Array 47 NASA Goddard 47 adaptive optics 47 gravitational lensing 47 Hubble Telescope 47 CfA 47 scientists 46 NASA Astrobiology Institute 46 computational methods 46 Collaboratory 46 exoplanet 46 GRB # 46 amateur astronomers 46 LIGO 46 EPOXI 46 Global Surveyor 46 X ray Observatory 46 Spitzer Space Telescope 46 numerical simulations 46 WMAP 46 SPIRE 46 orbiting telescope 46 telescope 46 Smithsonian Astrophysical Observatory 46 NRAO 45 LCROSS mission 45 LSST 45 Lowell Observatory 45 Thirty Meter Telescope 45 VLBA 45 Very Large Telescope 45 mathematicians 45 astronomy 45 NASA Cassini spacecraft 45 Spectrometer 45 habitable planets 45 NASA Cassini 45 astrobiologists 45 optical telescope 45 planetary scientist 45 NASA ESA Hubble 45 MARSIS 45 National Optical Astronomy 44 alien civilizations 44 NASA Hubble Space 44 OSIRIS 44 Kitt Peak 44 metagenomics 44 LCLS 44 HiRISE 44 planets 44 CloudSat 44 geodetic 44 Mars Reconnaissance Orbiter 44 Hubble Space Telescope