Related by context. Frequent words. (Click for all words.) 63 circular orbit 61 highly elliptical orbit 60 ecliptic 60 orbital 58 elliptical orbit 58 circular orbits 57 geoid 57 orbits 57 perihelion 56 tropospheric 55 SIRTF 55 Kuiper Belt objects 55 perigee 54 photometer 53 interplanetary spacecraft 53 irradiance 53 orbit 53 geosynchronous orbit 53 phonon 53 angular momentum 53 planetary 52 geostationary 52 occultation 52 anisotropy 52 Oort Cloud 52 optical wavelengths 52 interferometers 52 spacecraft 52 magnetic flux 52 orbiting 52 COROT 51 dynamical 51 radial velocity 51 solar corona 51 Venusian 51 photometry 51 WASP #b 51 innermost planet 51 radar altimeter 51 Cepheids 51 Earth orbit 51 planet orbits 51 unpressurized 51 mesosphere 50 celestial bodies 50 ion propulsion 50 -# ° C [001] 50 Jupiter Saturn 50 -# degrees Fahrenheit [002] 50 CoRoT 50 quadrupole 50 -# degrees Celsius [001] 50 poleward 50 equatorial 50 troposphere 50 planet Uranus 50 polar orbit 50 GeV 50 meteoroid 50 magnetization 50 solar irradiance 50 moon Charon 50 deg 50 SMOS 50 polar vortex 50 ionospheric 50 planetoid 50 equator 49 z = 49 spacecraft orbiting 49 west longitude 49 latitudinal 49 Earth magnetosphere 49 VIRTIS 49 interferometer 49 emissivity 49 ionosphere 49 outer planets 49 satellites orbiting 49 Olympus Mons 49 radiometer 49 atmospheric turbulence 49 Einstein theories 48 radiative 48 substorm 48 regolith 48 orbiting planets 48 elemental composition 48 longitudes 48 martian 48 Uranus 48 cryogenic temperatures 48 spectrographs 48 gravitational attraction 48 ultraviolet wavelengths 48 payload 48 velocities 48 MetOp 48 globular cluster 48 Itokawa 48 asteroid Itokawa