Related by context. Frequent words. (Click for all words.) 54 Andromeda Galaxy 54 planet orbiting 53 planetary nebulae 53 Cancri 53 photometry 53 planetary nebula 53 alien civilizations 52 terrestrial planets 52 Eta Carinae 52 Alpha Centauri 52 morphologies 52 Crab Nebula 52 distant galaxy 52 auroral 51 celestial object 51 interferometry 51 COROT 51 extrasolar planet 50 Andromeda galaxy 50 orbiting Saturn 50 microlensing 50 habitable planets 50 galaxy cluster 50 subatomic particle 50 Venusian 49 planets 49 Suzaku 49 star Gliese 49 planet orbits 49 HD #b [002] 49 Andromeda 49 habitable planet 49 solar corona 49 La Silla Chile 49 gravitational wave 49 planetoid 49 nebula 49 Kuiper belt 49 Solar System 49 XMM Newton 48 Gliese #g 48 Milky Way Galaxy 48 supernova explosion 48 celestial 48 GRB # 48 Betelgeuse 48 ejecta 48 NASA Cassini 48 rocky planets 48 Oort Cloud 48 magnetar 48 radial velocity 48 constellation Leo 48 planets orbiting 48 supernova 48 solar nebula 48 globular cluster 48 hydrothermal vent 48 galactic 48 Large Magellanic Cloud 48 astronomical objects 47 redshift 47 WIMPs 47 gamma ray burst 47 orbiting 47 exoplanets 47 Jupiter moons 47 redshifts 47 GRBs 47 ecliptic 47 interstellar medium 47 visible wavelengths 47 EPOXI 47 Planets 47 spectra 47 Galaxy Evolution 47 Fomalhaut 47 Jupiter Saturn 47 Voyager spacecraft 47 dwarf galaxy 47 orbiting planets 47 galaxy 47 planetary 46 GeV 46 interstellar 46 gravitationally 46 Orion Nebula 46 Sedna 46 moon Charon 46 accretion disk 46 astral 46 Mimas 46 infrared wavelengths 46 ionisation 46 constellation Orion 46 occultation 46 Type Ia supernovae 46 planets circling 46 orbits 46 infrared radiation 46 Algol