Related by context. Frequent words. (Click for all words.) 56 XMM Newton 56 Very Large Telescope 55 Spectrometer 55 exoplanets 54 extrasolar planet 52 astronomers 52 spectroscopic 52 planets orbiting 51 extrasolar planets 51 exoplanet 50 planet orbiting 48 HD #b [002] 48 Spitzer Space Telescope 48 gamma ray burst 47 telescopes 47 rocky planets 46 redshift 46 MESSENGER 46 Cassini spacecraft 46 interferometer 46 spectroscopy 46 astrophysicists 45 brown dwarf 45 NASA Cassini spacecraft 45 globular clusters 45 adaptive optics 45 supernovae 45 SDSS 45 quasars 45 gamma ray 45 spectrograph 45 distant galaxy 44 ESO 44 telescope 44 STEREO 44 X ray Observatory 44 galaxy cluster 44 spectra 44 brown dwarfs 44 infrared wavelengths 44 Cassini 44 Space Telescope 44 pulsar 44 gravitational waves 44 Planck 44 distant galaxies 44 celestial objects 44 Gliese 43 comet 43 NASA Chandra 43 planets 43 Astronomers 43 Corot 43 cosmic microwave background 43 unaided eye 43 neutrino 43 Sedna 43 THEMIS 42 ATLAS 42 WMAP 42 spectrometers 42 NASA Mars Reconnaissance 42 Higgs boson 42 ringed planet 42 Hubble Space Telescope 42 scanning electron microscope 42 quasar 41 Hubble telescope 41 supernova explosion 41 LCROSS 41 celestial bodies 41 supernova 41 lidar 41 spectrometer 41 Astrophysical Journal 41 amateur astronomers 41 Milky Way Galaxy 41 neutron star 41 cosmic ray 40 infrared 40 pulsars 40 Cassini orbiter 40 Milky Way galaxy 40 galaxies 40 Mars Reconnaissance Orbiter 40 gamma ray bursts 40 Enceladus 40 supernovas 40 dwarf galaxies 40 galaxy clusters 40 Itokawa 40 Hubble 39 RHIC 39 quark 39 spatial resolution 39 Einstein theory 39 comets 39 Deep Impact 39 Saturn rings 39 synchrotron 39 elliptical galaxies