Related by context. Frequent words. (Click for all words.) 73 WM Keck Observatory 67 Very Large Telescope 65 ESO Very Large Telescope 63 telescope 63 interferometer 63 optical telescopes 63 optical telescope 62 telescopes 62 infrared telescope 61 XMM Newton 61 Spitzer Space Telescope 60 Very Large Array 60 astronomers 60 interferometry 59 NASA Chandra 59 adaptive optics 59 gravitational lensing 58 distant galaxy 58 COROT 57 gravitational wave 57 spectroscopic 56 NASA Cassini spacecraft 56 observatories 56 X ray emission 56 Telescope 56 IceCube 56 extrasolar planets 55 seismometers 55 astronomical observations 55 planets orbiting 55 laser pulses 55 distant galaxies 55 quasars 55 infrared wavelengths 54 X ray Observatory 54 HD #b [002] 54 Palomar Observatory 54 Andromeda galaxy 54 redshift 53 supernova remnant 53 astrophysicists 53 Cassini Huygens 53 Observatories 53 exoplanet 53 quasar 53 extrasolar planet 53 scanning electron microscope 53 galaxy cluster 53 WMAP 53 cosmic ray 52 Gravity Probe B 52 Thirty Meter Telescope 52 celestial object 52 Space Telescope 52 Orion Nebula 52 LIGO 52 MODIS 52 infrared spectrometer 52 Andromeda Galaxy 52 optical microscope 52 pulsars 52 X ray beam 52 Astronomers 51 planet orbiting 51 magnetar 51 galaxy clusters 51 Hinode 51 photons 51 gravitational waves 51 astronomical objects 51 gamma ray 51 orbiting telescope 51 gamma ray burst 51 cosmic microwave background 51 electron microscope 51 elliptical galaxies 51 planetary scientist 51 seismographs 51 Eta Carinae 51 Cassini spacecraft 51 Large Magellanic Cloud 51 ionosphere 51 HARPS 50 comet nucleus 50 NASA Kepler 50 Spectrometer 50 spectrograph 50 Jet Propulsion Laboratory JPL 50 supernova explosion 50 transmission electron microscope 50 astronomer 50 laser pulse 50 exoplanets 50 pulsar 50 Planetary Laboratory 50 Einstein theory 50 Chandra X ray 50 robotic spacecraft 50 spectra 50 NASA Lunar Reconnaissance 50 X ray diffraction