Related by context. Frequent words. (Click for all words.) 63 Gamma ray bursts 62 circular orbits 62 magnetars 61 planetary nebulae 60 active galactic nuclei 60 Kuiper Belt objects 60 planet Uranus 60 planet orbits 60 Cepheids 59 redshifts 59 Jupiter Saturn 59 WASP #b 59 planets 58 super Earths 58 ecliptic 58 WIMPs 58 Kuiper belt 57 supernova remnants 57 hot Jupiters 57 astronomical objects 57 Oort Cloud 57 habitable zones 57 Earthlike 56 GRBs 56 ultraviolet wavelengths 56 Cosmic rays 56 Gamma rays 56 outer planets 56 innermost planet 56 novae 56 terrestrial planets 56 habitable planets 56 distant galaxy 56 star Gliese 56 perihelion 56 orbits 56 planets circling 55 planets orbiting 55 interplanetary spacecraft 55 extrasolar planets 55 Astrophysicists 55 radial velocity 55 baryons 55 gravitational wave 55 brown dwarfs 55 gravitational lensing 55 exoplanets 55 COROT 55 Earth magnetosphere 55 X ray emission 54 globular clusters 54 aurorae 54 planetary nebula 54 orbiting planets 54 XMM Newton 54 nebulae 54 magnetar 54 Hubble observations 54 redshift 54 celestial object 54 constellation Leo 54 extrasolar planet 54 celestial bodies 54 NASA Cassini 54 Saturn moons 54 optical wavelengths 53 dwarf galaxies 53 microlensing 53 Andromeda galaxy 53 Jupiter moons 53 Orion Nebula 53 HD #b [002] 53 photometry 53 electron spins 53 shorter wavelengths 53 solar corona 53 Type Ia supernovae 53 spiral galaxies 53 VIRTIS 53 moons 53 neutron stars 53 Cosmologists 53 gamma ray bursts 53 supernova explosions 53 gravitational waves 53 magnetosphere 53 Sedna 53 astronomers 53 interstellar dust 53 moonlets 53 moon Europa 53 rocky planets 52 unaided eye 52 Supernovae 52 auroral 52 Comet McNaught 52 spatial dimensions 52 GeV 52 Andromeda Galaxy 52 spacecraft orbiting 52 Pulsars