Related by context. Frequent words. (Click for all words.) 67 Very Large Telescope 58 optical telescope 56 ESO Very Large Telescope 54 optical telescopes 54 telescope 54 infrared telescope 53 Gemini Observatory 53 COROT 53 Observatory 52 WM Keck Observatory 52 Telescope 52 extrasolar planet 52 XMM Newton 52 astronomers 51 microlensing 51 X ray Observatory 51 telescopes 51 Spitzer Space Telescope 51 OGLE 50 celestial object 50 Palomar Observatory 50 volcanically active 50 X ray telescope 49 Cancri 49 Astronomers 49 planet orbiting 49 extrasolar planets 49 Observatories 48 VLBA 48 NASA Chandra 48 interferometer 48 NASA Mars Odyssey 48 NASA Cassini spacecraft 48 HD #b [002] 48 interferometry 48 observatories 48 NASA Aqua 48 Gliese 48 MARSIS 48 Very Large Array 47 unaided eye 47 astronomical observatory 47 Spectrometer 47 astronomical observations 47 journal Astronomy 47 MODIS 47 spectrograph 47 Astronomical Society 47 scanning electron microscope 47 astronomical objects 47 astronomer 47 geologically active 46 aurora 46 moon Charon 46 infrared wavelengths 46 galaxy cluster 46 interplanetary spacecraft 46 seismometers 46 observatory 46 amateur astronomers 46 IceCube 46 distant galaxy 46 NASA Kepler 46 HARPS 46 visible wavelengths 46 rocky planets 46 field Infrared Survey 45 THEMIS 45 CloudSat 45 seismographs 45 Astrophysics 45 Space Agency 45 meteoroids 45 super Earths 45 sediment cores 45 celestial objects 45 Space Telescope 45 skywatchers 45 Andromeda galaxy 45 planetary scientist 44 Arecibo Observatory 44 Gamma Ray 44 gravitational wave 44 OSIRIS 44 optical microscopy 44 gravitational waves 44 orbiting Saturn 44 Andromeda Galaxy 44 auroras 44 habitable planet 44 Cassini Huygens 44 radiometer 44 gamma ray burst 44 Molecular Biology Laboratory 44 spectrometers 44 hyperspectral 44 meteorites 44 Saturn moon Enceladus 44 Cassini spacecraft 44 orbiting Mars 44 ionospheric