Related by context. Frequent words. (Click for all words.) 59 Hubble observations 58 COROT 58 XMM Newton 57 redshift 57 GRB # 57 Eta Carinae 56 globular clusters 56 astronomical observations 56 planetary nebulae 55 Type Ia supernovae 55 Voyager spacecraft 55 gravitational lensing 55 magnetar 55 X ray emission 55 astronomical objects 55 Milky Way Galaxy 54 Crab Nebula 54 planet orbiting 54 GRBs 54 GeV 54 ejecta 54 spectra 54 Galaxy Evolution 54 active galactic nuclei 54 supernova explosion 53 microlensing 53 WMAP 53 Sedna 53 isotopic composition 53 globular cluster 53 gamma ray burst 53 brown dwarfs 53 galaxy formation 53 spectroscopic 53 HD #b [002] 53 ionospheric 53 planetary nebula 52 photometric 52 solar nebula 52 comet nucleus 52 cosmic ray 52 orbits 52 elliptical galaxies 52 auroral 52 observable universe 52 pulsars 52 abundances 52 isotopic 52 Saturn rings 52 celestial object 52 solar corona 52 Global Surveyor 52 supernova remnant 52 distant galaxies 52 irradiance 52 WM Keck Observatory 52 pulsar 52 extrasolar planet 52 exoplanet 51 solar irradiance 51 Fomalhaut 51 SMOS 51 Algol 51 supernovae 51 gravitational wave 51 planets circling 51 Gliese #g 51 NASA Cassini spacecraft 51 occultation 51 supernova remnants 51 GOCE 51 muon 51 Spectrometer 51 positrons 51 spacecraft orbiting 50 astronomers 50 wavefront 50 Orion Nebula 50 NASA Cassini 50 cosmic microwave background 50 cosmological 50 dwarf galaxy 50 supernova 50 anisotropy 50 planets orbiting 50 dynamical 50 Haumea 50 outer planets 50 planetoid 50 supernova explosions 50 quasars 50 distant galaxy 50 Einstein theory 50 HiRISE 50 Andromeda Galaxy 50 celestial objects 50 dwarf galaxies 50 Jupiter moons 50 longitudes 49 meteoroid 49 galaxy cluster