Related by context. Frequent words. (Click for all words.) 65 XMM Newton 64 radial velocity 63 occultation 62 aurorae 62 solar corona 62 microlensing 61 planetary nebulae 61 polar vortex 60 WASP #b 60 NASA Cassini spacecraft 60 Galaxy Evolution 60 Cepheids 59 magnetic reconnection 59 substorms 59 innermost planet 59 planet Uranus 59 Galileo spacecraft 58 Hubble observations 58 GRBs 58 ESO Very Large Telescope 58 interplanetary spacecraft 58 X ray emission 58 ringed planet 58 auroral 57 HD #b [002] 57 extrasolar planet 57 GRB # 57 planet orbits 57 Gamma ray bursts 57 COROT 57 interferometric 57 perihelion 57 astronomical observations 57 gamma ray burst 57 supernova explosion 57 Mauna Kea Hawaii 57 photometry 57 Voyager spacecraft 56 photometer 56 spacecraft orbiting 56 spectrographs 56 Cassini Huygens 56 gravitational lensing 56 astronomical objects 56 protoplanetary disk 56 OGLE 56 active galactic nuclei 55 Cancri 55 spectroscopic 55 Earth magnetosphere 55 extrasolar planets 55 orbits 55 Mini SAR 55 numerical simulations 55 cosmic ray 55 interferometry 55 Jupiter Saturn 55 Orion Nebula 55 planetary nebula 55 optical wavelengths 55 magnetar 55 MARSIS 55 Halley comet 55 star Gliese 55 exoplanets 55 VLBI 55 Flyby 55 interstellar dust 55 Spitzer Space Telescope 55 galaxy cluster 54 solar nebula 54 NASA Stardust spacecraft 54 NASA Cassini 54 exoplanet 54 magnetars 54 terrestrial planets 54 moonlets 54 EPOXI 54 GOCE 54 galaxy clusters 54 infrared wavelengths 54 distant galaxies 54 Saturn moon Enceladus 54 dwarf galaxy 54 SMOS 54 Very Large Array 54 Solar System 54 OSIRIS 54 Hinode 54 X ray Observatory 54 comet nucleus 54 Eta Carinae 54 attosecond 54 Comet McNaught 54 Saturn rings 54 solar irradiance 54 celestial object 54 Kuiper belt 53 distant galaxy 53 planetesimals 53 auroras