Related by context. Frequent words. (Click for all words.) 56 Gamma ray bursts 56 NASA Cassini 55 stellar nurseries 55 habitable zones 55 Andromeda Galaxy 55 Milky Way 54 planet orbits 54 Earthlike 54 Oort Cloud 54 magnetars 54 Milky Way Galaxy 54 redshifts 54 super Earths 53 potentially habitable 53 globular cluster 53 active galactic nuclei 53 Cepheids 53 Andromeda galaxy 53 rocky planets 53 planetary nebulae 53 habitable planets 52 Kuiper Belt objects 52 aurorae 52 planets 52 unaided eye 52 habitable planet 52 Supernovae 52 circular orbits 52 radial velocity 52 spatial dimensions 51 Goldilocks zone 51 distant galaxy 51 galaxy formation 51 planet Uranus 51 WASP #b 51 geoid 51 extrasolar planet 51 GRBs 51 planets orbiting 51 Milky Way galaxy 51 observable universe 50 innermost planet 50 undersea volcanoes 50 JPL manages 50 celestial object 50 Jupiter Saturn 50 spiral galaxies 50 Saturn moons 50 distant galaxies 50 supernova remnants 50 astronomers 50 Meteor Shower 50 Type Ia supernovae 50 comet nucleus 50 galaxy NGC 50 planet orbiting 50 terrestrial planets 50 Cancri 50 nebulas 49 Crab Nebula 49 Kuiper belt 49 Orion Nebula 49 brown dwarfs 49 HD #b [002] 49 solar corona 49 Higgs particle 49 Flyby 49 orbits 49 extrasolar planets 49 gravitational lens 49 hot Jupiters 49 Olympus Mons 49 nebulae 49 baryons 49 outer planets 49 protoplanetary disk 49 protostars 49 moonlets 49 COROT 49 microlensing 49 Jupiter Saturn Uranus 49 subatomic particle 49 Jupiter moons 49 Carina Nebula 49 Galaxy Evolution 49 elemental composition 48 optical wavelengths 48 ecliptic 48 Gamma rays 48 Cosmologists 48 globular clusters 48 Valles Marineris 48 Orbiting 48 Astrophysicists 48 elliptical galaxies 48 volcanically active 48 outer crust 48 spiral galaxy 48 astronomical objects 48 interplanetary spacecraft 48 moon Charon