Related by context. Frequent words. (Click for all words.) 68 ESO Very Large Telescope 64 Very Large Telescope 60 XMM Newton 59 optical telescopes 57 La Silla Chile 57 optical telescope 56 infrared telescope 56 astronomical observations 56 Cassini orbiter 56 microlensing 56 COROT 56 spacecraft orbiting 55 WM Keck Observatory 55 telescopes 55 QuickBird 54 WFC3 53 particle detector 52 Voyager spacecraft 52 Very Large Array 52 orbiting Saturn 52 Keck Observatory 52 NASA Cassini spacecraft 52 Spectrometer 52 telescope 52 Lutetia 52 extrasolar planets 52 radar altimeter 51 Solar Dynamics 51 Kepler telescope 51 interplanetary spacecraft 51 NASA ESA Hubble 51 SMOS 51 ringed planet 51 Spitzer Space Telescope 51 NASA Lunar Reconnaissance 51 VLBA 51 occultation 51 adaptive optics 51 Gemini Observatory 51 spectrometers 50 cosmic microwave background 50 OGLE 50 HARPS 50 IKONOS 50 NASA Kepler 50 CALIPSO 50 GOCE 50 NASA Chandra 50 orbiting Mars 50 NASA Mars Odyssey 50 optical microscopy 49 observatories 49 Cancri 49 solar corona 49 GRB # 49 Messenger spacecraft 49 interferometer 49 Cassini Huygens 49 Arecibo Observatory 49 ICESat 49 NASA Mars Reconnaissance 49 geostationary satellites 49 Hubble observations 49 X ray Observatory 49 Comet McNaught 49 rovers Spirit 49 hyperspectral 49 NASA Cassini 49 ESO 49 Mini SAR 49 astronomers 49 Gamma ray bursts 48 OSIRIS 48 MARSIS 48 star Gliese 48 super Earths 48 HRSC 48 Global Surveyor 48 substorms 48 powerful particle accelerator 48 journal Astronomy 48 European Synchrotron Radiation 48 Observatories 48 Cassini spacecraft 48 redshifts 48 unaided eye 48 Galaxy Evolution 48 innermost planet 48 colliders 48 orbiting telescope 48 Titan Saturn 48 remote sensing satellites 48 interferometry 47 Telescope 47 Orion Nebula 47 infrared wavelengths 47 spectrograph 47 Space Telescope 47 Mars orbiter 47 spectroscopic 47 field Infrared Survey