Related by context. Frequent words. (Click for all words.) 69 XMM Newton 68 NASA Cassini spacecraft 64 WMAP 63 galaxy clusters 63 spectroscopic 62 astronomers 62 extrasolar planets 61 Spitzer Space Telescope 61 NASA Chandra 60 distant galaxy 60 Cassini 60 spectra 59 distant galaxies 59 supernova explosion 59 infrared wavelengths 59 globular clusters 59 brown dwarfs 59 planets orbiting 59 X ray Observatory 59 redshift 58 exoplanets 58 Milky Way Galaxy 58 astrophysicists 58 galaxy cluster 58 gamma ray burst 58 quasars 58 dwarf galaxies 57 Saturn rings 57 exoplanet 57 gamma ray bursts 57 astrophysical 57 quasar 57 THEMIS 57 HiRISE 57 supernovae 57 Astrophysical Journal 57 gravitational waves 57 Very Large Telescope 57 Enceladus 57 galaxies 56 general relativity 56 rocky planets 56 planet orbiting 56 adaptive optics 56 Mars Reconnaissance Orbiter 55 Space Telescope 55 brown dwarf 55 cosmic microwave background 55 spatial resolution 54 HD #b [002] 54 heliosphere 54 Planck 54 neutrino 54 cosmologists 54 Chandra X ray 54 interstellar dust 54 planets 54 interferometer 54 cometary 54 flybys 54 Astrophysical Journal Letters 54 comet dust 54 flyby 54 Cassini orbiter 53 Cassini spacecraft 53 NASA Mars Reconnaissance 53 neutron stars 53 neutron star 53 sunspot 53 abundances 53 spectroscopy 53 pulsars 53 Einstein theory 53 supermassive black holes 53 celestial objects 53 telescopes 53 comet 53 Spectrometer 52 spiral galaxies 52 nebulae 52 Milky Way galaxy 52 spectrometer 52 cosmic rays 52 supernovas 52 comet Wild 52 pulsar 52 Betelgeuse 52 NASA Hubble Space 52 neutrinos 51 Milky Way 51 magnetosphere 51 GLAST 51 nebula 51 laser pulses 51 spectrometers 51 supermassive black hole 51 magnetic fields 51 supernova 51 planetary science 51 diffraction 51 JWST