Related by context. Frequent words. (Click for all words.) 56 microlensing 56 Very Large Telescope 55 optical telescope 55 WM Keck Observatory 53 telescopes 53 Lick Observatory 53 Telescope 53 ESO Very Large Telescope 52 adaptive optics 52 telescope 52 X ray telescope 51 NRAO 50 Very Large Array 50 VLBA 50 IceCube 50 infrared telescope 50 Spectrometer 50 Cassini Huygens 50 transmission electron microscope 50 Gemini Observatory 50 gravitational lensing 49 Palomar Observatory 49 spectrometer 49 interferometer 48 Spitzer Space Telescope 48 beamline 48 spectroscopic 48 astronomers 48 LIGO 48 XMM Newton 48 NASA Chandra 48 Arecibo Observatory 47 Observatories 47 THEMIS 47 HD #b [002] 47 OSIRIS 47 extrasolar planet 47 spectrograph 47 COROT 46 scanning tunneling microscope 46 Andromeda galaxy 46 Andromeda Galaxy 46 Resolution Imaging 46 MARSIS 46 CALIPSO 46 astronomical observatory 46 Observatory 46 scanning electron microscope 46 optical telescopes 46 gravitational wave 46 Radio Astronomy Observatory 46 Planetary Laboratory 45 LSST 45 observatory 45 NASA Kepler 45 Lowell Observatory 45 observatories 45 infrared spectrometer 45 interferometry 45 X ray Observatory 45 moon Charon 45 orbiting Saturn 45 redshift 45 Space Telescope 45 SQUID 45 synchrotron 45 astrophysical 45 galaxy cluster 45 optical microscope 44 interplanetary spacecraft 44 Orion Nebula 44 terrestrial planets 44 exoplanet 44 planets orbiting 44 distant galaxies 44 NASA ESA Hubble 44 Solar System 44 planetary scientist 44 OGLE 44 Hubble Space Telescope 44 LCLS 44 seismometers 44 CubeSat 44 gamma ray 44 cosmic ray 44 orbiting 43 Credit NASA JPL 43 Milky Way Galaxy 43 optical microscopy 43 distant galaxy 43 CloudSat 43 planet orbiting 43 particle accelerator 43 Astrophysicist 43 astronomer 43 HARPS 43 NASA Goddard 43 HiRISE 43 GRB # 43 orbiting telescope 43 SELENE