Related by context. Frequent words. (Click for all words.) 56 Cosmologists 55 galaxy formation 53 Earthlike 52 substorm 52 protoplanetary disk 52 Eagle Nebula 51 outer planets 51 Snowball Earth 51 Phaethon 51 magnetic reconnection 51 supernova explosion 51 God Particle 51 WASP #b 50 Cepheids 50 planetary nebulae 50 planetary nebula 50 Gliese #g 50 supernova explosions 50 radial velocity 50 Viking landers 50 heliosheath 50 solar nebula 50 magnetars 49 brown dwarfs 49 protostar 49 quark gluon plasma 49 cosmic microwave background 49 accretion disk 49 Kuiper belt 49 COROT 49 Jupiter Saturn 49 geoid 49 planetesimals 49 super Earths 48 Crab Nebula 48 habitable planets 48 supercontinent 48 Meteor Shower 48 XMM Newton 48 Astrophysicists 48 Higgs particle 48 stellar nurseries 48 perihelion 48 photosphere 48 innermost planet 48 SIRTF 48 Galileo spacecraft 48 planet orbits 48 NASA Chandra 48 GRB # 48 NASA Stardust spacecraft 47 Galaxy Evolution 47 Valles Marineris 47 subatomic particle 47 globular clusters 47 noctilucent clouds 47 CoRoT 47 planet Uranus 47 Oort Cloud 47 Gamma ray bursts 47 Andromeda Galaxy 47 interstellar medium 47 cosmologists 47 constellation Leo 46 planetoid 46 habitable planet 46 rocky planets 46 Stardust NExT 46 Type Ia supernovae 46 redshift 46 metallicity 46 cosmological constant 46 observable universe 46 gravitational attraction 46 astrobiologists 46 Cambrian explosion 46 interplanetary spacecraft 46 dwarf galaxy 46 Nibiru 46 X ray Observatory 46 GRBs 46 Saturn moons 46 Anthropocene 46 protostars 46 Solar System 45 Cassini Huygens 45 baryons 45 terrestrial planets 45 Higgs Boson 45 WMAP 45 substorms 45 circular orbits 45 redshifts 45 gravitational lens 45 ejecta 45 RQ# 45 microlensing 45 extrasolar planet 45 galaxies 45 GOCE 45 Saturn rings