Related by context. Frequent words. (Click for all words.) 52 telescopes 52 telescope 52 Andromeda Galaxy 51 optical telescope 49 Andromeda galaxy 49 infrared telescope 48 Orion Nebula 48 interplanetary spacecraft 48 observatories 47 constellation Orion 47 optical telescopes 47 Pan STARRS 47 observatory 47 Palomar Observatory 47 XMM Newton 46 microlensing 46 ESO Very Large Telescope 46 Very Large Telescope 45 astronomical observatory 45 volcanically active 45 astronomers 45 Thirty Meter Telescope 45 SkyScout 45 Eta Carinae 45 microscopic imager 44 VLBA 44 astronomical objects 44 Telescope 44 WM Keck Observatory 44 Comet McNaught 44 X ray telescope 44 Celestron 44 Cassini spacecraft 44 Mars Reconnaissance Orbiter 44 GRB # 44 Cancri 43 distant galaxy 43 aurora borealis 43 adaptive optics 43 spacecraft orbiting 43 celestial object 43 COROT 43 comet nucleus 43 Cassini orbiter 43 celestial objects 43 Gamma ray bursts 42 moon Charon 42 infrared 42 orbiting observatory 42 Galaxy Evolution 42 gamma ray burst 42 Resolution Imaging 42 Pleiades 42 panoramic camera 42 unaided eye 42 constellation Leo 42 Global Surveyor 42 NASA ESA Hubble 42 spiral galaxy 42 orbiting telescope 42 Iapetus 42 rock outcrop 42 nebula 41 Astronomers 41 Milky Way Galaxy 41 astronomical observations 41 star gazers 41 Fresnel lens 41 planet orbiting 41 Skywatchers 41 occultation 41 substorms 41 Telescopes 41 aperture 41 star Gliese 41 extrasolar planet 41 lava tubes 41 Perseid meteor shower 41 SELENE 41 Geminids 41 Very Large Array 41 Mars orbiter 41 ecliptic 41 Crab Nebula 41 Hubble telescope 41 satellites orbiting 41 auroras 41 planets orbiting 40 panorama 40 #x zoom [001] 40 magnetic compass 40 infrared wavelengths 40 unmanned spacecraft 40 X ray beams 40 meteor shower 40 interferometer 40 innermost planet 40 stargazers 40 Lick Observatory 40 Large Magellanic Cloud 40 breathtaking views