Related by context. Frequent words. (Click for all words.) 66 orbiting planets 65 radial velocity 60 microlensing 60 moonlets 60 aurorae 58 WASP #b 58 Gamma ray bursts 58 Andromeda galaxy 58 Cosmic rays 58 ultraviolet wavelengths 58 Earthlike 57 planet Uranus 57 comet tail 57 nebulae 57 Galaxy Evolution 57 habitable zones 56 Oort Cloud 56 celestial object 56 Saturn moons 56 XMM Newton 56 meteoroids 56 SIRTF 56 photometer 56 COROT 56 Saturn rings 56 noctilucent clouds 56 Jupiter moons 56 interplanetary spacecraft 55 atmospheric turbulence 55 muons 55 unaided eye 55 innermost planet 55 distant galaxy 55 orbiting spacecraft 55 X ray emission 55 Solar flares 55 planetary nebulae 55 Saturn moon 55 meteoroid 55 spacecraft orbiting 55 Cepheids 54 comet nucleus 54 planets 54 accretion disk 54 Martian rocks 54 active galactic nuclei 54 Gamma rays 54 protoplanetary disk 54 comet 54 highly elliptical orbit 54 magnetars 54 Saturn moon Enceladus 54 planets circling 54 optical wavelengths 54 circular orbits 54 gravitational wave 54 Cancri 54 habitable planets 53 Jupiter Saturn 53 Comet McNaught 53 Spitzer Space Telescope 53 interstellar dust 53 rocky planets 53 cosmic ray 53 extrasolar planets 53 magnetosphere 53 hot Jupiters 53 magnetic reconnection 53 planets orbiting 53 polar vortex 53 martian soil 53 outer planets 53 Kuiper Belt objects 53 astronomers 53 supernova explosion 53 galaxy NGC 53 Galileo spacecraft 53 Amateur astronomers 52 starlight 52 planet orbits 52 Haumea 52 nebulas 52 Kuiper belt 52 gravitational tug 52 starbursts 52 RQ# 52 solar corona 52 astronomical objects 52 dwarf galaxy 52 constellation Orion 52 planet orbiting 52 extrasolar planet 52 distant galaxies 52 star Gliese 52 asteroids 52 terrestrial planets 52 cosmic rays 52 ionised 52 infrared telescope 52 gamma ray burst 52 gravitational waves