Related by context. Frequent words. (Click for all words.) 67 rocky planets 63 super Earths 63 hot Jupiters 62 brown dwarfs 62 terrestrial planets 61 Jupiter Saturn Uranus 61 moon Europa 60 planets 60 HD #b [002] 60 solar nebula 60 planet orbits 59 habitable planets 59 unaided eye 59 planets orbiting 59 elliptical galaxies 59 ejecta 59 Jupiter Saturn 59 globular clusters 59 Gamma ray bursts 58 X ray emission 58 galaxy clusters 58 meteoroids 58 silicates 58 nebulae 58 habitable zone 57 brown dwarf 57 extrasolar planets 57 outer planets 56 spiral galaxies 56 Kuiper belt 56 dwarf galaxies 56 olivine 56 globular cluster 56 lavas 56 orbits 56 supernova explosions 56 interstellar dust 56 quasars 56 planet orbiting 55 ionized gas 55 GRBs 55 moon Charon 55 gravitationally 55 lithosphere 55 Eta Carinae 55 neutron stars 55 visible wavelengths 55 accretion disk 55 magnetar 55 Milky Way Galaxy 55 galaxy formation 54 extrasolar planet 54 astronomical objects 54 carbonaceous 54 infrared wavelengths 54 organic molecules 54 magnetosphere 54 comets 54 Earth magnetosphere 54 volcanically active 54 lunar poles 54 liquid droplets 53 galaxies 53 exoplanet 53 spherules 53 Saturn moon Enceladus 53 comet nucleus 53 habitable planet 53 Orion Nebula 53 iron oxides 53 celestial bodies 53 scarps 53 galaxy cluster 53 exoplanets 53 Kuiper Belt 53 supernova explosion 53 Enceladus 53 optical telescopes 52 coronal mass ejections 52 interstellar medium 52 supernovae 52 gravitational attraction 52 geologically active 52 Gliese 52 celestial objects 52 Milky Way galaxy 52 Large Magellanic Cloud 52 magnetic fields 52 dwarf galaxy 52 celestial object 52 supernova remnant 52 dwarf planets 52 Saturn moons 52 Andromeda galaxy 52 Gliese #g 52 Cancri 52 moons 52 quasar 52 accreting 52 polar caps 52 Haumea