Related by context. Frequent words. (Click for all words.) 66 extrasolar planet 60 magnetar 59 HD #b [002] 59 supernova 59 distant galaxy 59 supernova explosion 58 Gamma ray bursts 58 planet orbiting 58 planet orbits 58 Earth magnetosphere 58 interstellar dust 57 orbiting 57 subatomic particle 57 dwarf galaxy 57 Crab Nebula 57 brown dwarf 57 ringed planet 57 Gliese #g 57 Eta Carinae 56 comet 56 galaxy 56 interplanetary spacecraft 56 gamma ray burst 56 infrared telescope 55 Jupiter moons 55 exoplanet 55 globular cluster 55 accretion disk 55 planetary nebula 55 X ray emission 55 exoplanets 55 neutron star 55 extrasolar planets 54 GRBs 54 microlensing 54 super Earths 54 orbits 54 COROT 54 distant galaxies 54 Kuiper belt 54 Cancri 54 planetoid 54 Kepler telescope 54 galaxy formation 54 Saturn rings 53 ionized gas 53 Spitzer Space Telescope 53 buckyball 53 XMM Newton 53 Voyager spacecraft 53 supernova explosions 53 hot Jupiters 53 Opportunity rover 53 supernova remnant 53 Orion Nebula 53 Haumea 53 orbiting Saturn 53 supernova remnants 52 pulsar 52 Milky Way Galaxy 52 asteroid 52 brown dwarfs 52 globular clusters 52 galaxies 52 planets 52 moon Charon 52 cometary 52 comet nucleus 52 occultation 52 meteoroid 52 Solar System 52 gravitational lensing 52 rover Opportunity 52 galaxy cluster 52 elliptical galaxies 51 X ray Observatory 51 nebula 51 supernovas 51 rocky planets 51 solar nebula 51 dwarf galaxies 51 Saturn moon 51 NASA Cassini spacecraft 51 Sedna 51 Andromeda galaxy 51 spacetime 51 Milky Way galaxy 51 Cabeus crater 51 astronomical observations 51 celestial object 51 galaxy clusters 51 astronomers 51 Cassini Huygens 51 supernovae 51 coronal mass ejection 51 comets 51 spiral galaxy 51 EPOXI 51 quasar 51 lunar soil 51 habitable planet