Related by context. Frequent words. (Click for all words.) 54 terrestrial planets 53 planet orbiting 52 rocky planets 52 extrasolar planet 52 super Earths 50 exoplanet 50 galaxy cluster 49 habitable planet 49 habitable planets 49 organic molecules 49 hot Jupiters 49 exoplanets 49 Milky Way galaxy 48 spectroscopic 48 neutron star 48 astronomical objects 48 pulsars 48 globular cluster 47 dwarf galaxy 47 brown dwarfs 47 extrasolar planets 47 silicates 47 magnetar 46 supermassive black hole 46 Kuiper belt 46 nanodiamonds 46 planetary 46 HD #b [002] 46 neutrino 46 moon Charon 46 gamma ray burst 46 supernova explosion 46 nebulae 46 gamma ray bursts 46 brown dwarf 46 celestial object 46 accretion disk 46 distant galaxy 46 galaxy formation 45 comet dust 45 Jupiter Saturn Uranus 45 planets 45 galaxy clusters 45 interstellar medium 45 Sedna 45 comets 45 globular clusters 45 galaxy 45 Milky Way Galaxy 44 galaxies 44 astrophysical 44 high temperature superconductors 44 XMM Newton 44 comet 44 neutron stars 44 quark gluon plasma 44 elliptical galaxies 44 particles 44 Kuiper Belt 44 supernova remnant 44 Saturn moons 44 pulsar 44 superfluidity 44 planets orbiting 43 GRBs 43 dwarf galaxies 43 quasars 43 spiral galaxy 43 molecules 43 distant galaxies 43 astrobiology 43 aerosol particles 43 chirality 43 geologically active 43 cosmic microwave background 43 X ray emission 43 particle 43 supernova explosions 43 oxygen atom 43 olivine 43 Spitzer Space Telescope 43 atomic nuclei 43 meteorites 42 atoms 42 nebula 42 molecular 42 atomic nucleus 42 moon Titan 42 supernovae 42 gravitationally 42 supermassive black holes 42 astronomers 42 magnetosphere 42 planetary scientist 42 meteorite 42 infrared telescope 42 Eta Carinae 42 nanostructure 42 Iapetus 42 Orion Nebula 42 ionic liquids