Related by context. Frequent words. (Click for all words.) 44 planetary 39 dynamical 38 habitable planets 36 multiverse 36 planets 36 gravitationally 36 terrestrial planets 35 interstellar 35 spacetime 34 earths 34 Martian 34 primordial 34 magnetosphere 34 entropy 34 atoms 34 angular momentum 34 astrobiologists 34 intergalactic 34 martian 33 biosphere 33 galaxy formation 33 galactic 33 cosmic 33 cosmological 33 cephalopod 33 extraterrestrial 33 geomagnetic 33 rocky planets 32 Kuiper belt 32 polar 32 slugs 32 neutrino 31 galaxy 31 brown dwarfs 31 interstellar medium 31 magnetar 31 universe 31 spectroscopic 31 dwarf galaxies 31 hot Jupiters 31 subatomic 31 slug 31 cosmic ray 31 elliptical galaxies 31 dwarf planets 31 magnetic fields 31 Uranus 31 extrasolar planets 31 convective 31 earthlings 30 habitable planet 30 Earths 30 outer planets 30 super Earths 30 moon Europa 30 orbital 30 Gliese #g 30 interplanetary 30 astrophysical 30 cometary 29 cosmos 29 galaxy clusters 29 neanderthal 29 globular cluster 29 Planetary 29 Earth magnetosphere 29 gravitational 29 hornet 29 supermassive black holes 29 ejecta 29 Saturn moons 29 brown dwarf 29 orbiting 28 meteoroid 28 Universe 28 celestial bodies 28 outer space 28 supernova explosion 28 heliosphere 28 plate tectonics 28 Jupiter moons 28 asteroid 28 planet 28 HD #b [002] 28 AFK 28 COROT 28 occultation 28 exoplanet 27 supernova explosions 27 Alpha Centauri 27 globular clusters 27 auroral 27 cockroach 27 rover 27 astrophysicists 27 leech 27 Kuiper Belt 27 orbits 27 extrasolar planet 27 Enceladus 27 dwarf galaxy