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(Click for frequent words.) 68 axial tilt 65 orbital eccentricity 65 orbital resonance 64 rotational axis 63 circular orbit 62 Earth radii 62 prograde 62 geo synchronous 62 orbital velocity 62 Lagrangian 61 jovian 61 equatorial orbit 61 highly elliptical orbit 60 Yarkovsky effect 60 Churyumov Gerasimenko 60 elongated orbits 60 gravitational acceleration 60 ecliptic plane 60 ecliptic 60 Pluto Charon 60 orbital 59 geostationary orbits 59 Comet Churyumov Gerasimenko 59 SIM PlanetQuest 59 obliquity 59 Kuiper Belt Objects 59 axis perpendicular 59 Epsilon Eridani 59 geo stationary orbit 59 Kuiper belt objects 59 planetary Transits 59 θ 58 airglow 58 entire Milstar constellation 58 Jovian moons 58 elliptical orbit 58 planets orbits 58 Kuiper belt object 58 eclipsing binary 58 Milankovitch cycles 58 geosynchronous 58 BepiColombo 58 circular orbits 58 retrograde orbit 58 arcsecond 57 astrometry 57 velocity vector 57 ballistic trajectory 57 Kepler 9c 57 Saturn Cassini 57 geoid 57 #.#nm [002] 57 arcminutes 57 radial velocities 57 orbits 57 radians 57 laser altimeter 57 Earth gravitational pull 57 ion thrusters 57 Rossby waves 57 dipole moment 57 perihelion 57 velocity dispersion 57 orbit GEO 57 solar radii 57 orbital radius 57 albedo reflectivity 57 arcseconds 57 cosmic ray flux 57 occultations 56 exoplanetary 56 moons Phobos 56 φ 56 Shackleton crater 56 carry heavier payloads 56 orbital altitude 56 baryon 56 planetary surfaces 56 thruster firings 56 gravitational keyhole 56 azimuthal 56 highly elliptical orbits 56 SBSS satellite 56 orbital mechanics 56 BLG #Lb 56 LISA Pathfinder 56 waning gibbous 56 GJ#b 56 elliptical orbits 56 celestial equator 56 cosmological distances 56 lunar equator 56 Saturnian 56 tropospheric 56 crewed spacecraft 56 rotational velocity 56 Kuiper Belt object 56 Philae lander 55 planetary orbits 55 comets orbiting 55 SIRTF 55 retroreflector 55 celestial sphere 55 synchronous orbit 55 gravitational slingshot 55 Jupiter Ganymede 55 -# ° F [001] 55 #P/Churyumov-Gerasimenko 55 aphelion 55 Pluto dwarf 55 Fomalhaut b 55 Kuiper Belt objects 55 orbital rendezvous 55 Upsilon Andromedae 55 resonance frequency 55 LEO satellites 55 perigee 55 APXS 55 teleoperated 55 icy moons 55 comet Churyumov Gerasimenko 55 perigee closest 55 compass headings 55 galactic equator 55 apogee farthest point 55 gravitational pulls 55 circularize 55 helicity 55 gravitational interaction 55 magnon 55 sidereal 55 Orbital Slot 55 exosphere 55 Encke gap 55 retrograde orbits 55 Sun synchronous orbit 55 ASTRA 2C 55 geosynchronous satellite 55 orbital angular momentum 55 -# Celsius [001] 55 waxing gibbous 55 extrasolar 54 AUs 54 magnetotail 54 slender crescent 54 sextile 54 meteoritic material 54 arcsec 54 Mercury exosphere 54 magnetic polarity 54 KBOs 54 HD #b [001] 54 equatorial latitudes 54 inhabitable planets 54 libration 54 orbiter lander 54 Comet #P/Churyumov-Gerasimenko 54 GQ Lupi 54 circular polarization 54 Manned missions 54 X ray binaries 54 Corot 9b 54 reentry capsule 54 Comet Halley 54 ellipsoid 54 Cartesian coordinates 54 geosynchronous satellites 54 Optical Spectroscopic 54 Gliese #c 54 Rayleigh scattering 54 GZK cutoff 54 XTE J# 54 PSR J# 54 IBEX spacecraft 54 X ray binary 54 photometer 54 irregularly shaped asteroid 54 Jupiter icy moons 54 Pluto Eris 54 Astronomical Units 54 metallicity 54 weakly interacting 54 galactic disk 54 SMOS mission 54 magnetic dipole 54 Cancri e 53 geosynchronous Earth 53 planet Gliese #g 53 Hubble Constant 53 NEAs 53 Epsilon Aurigae 53 longitudinal axis 53 orbital slot 53 LRO LCROSS 53 Astra 1L 53 Mpc 53 interplanetary spacecraft 53 neutrino mass 53 exoplanets planets 53 CoRoT #b 53 linearly polarized 53 maneuvering thrusters 53 impactor spacecraft 53 lunar orbits 53 Hubble orbits 53 ASTRA 1G 53 XTAR EUR 53 moons Europa 53 irradiance 53 circumstellar disk 53 cometary material 53 orbit 53 comet hurtling 53 geosynchronous orbits 53 synthetic aperture 53 sun synchronous orbit 53 stellar occultation 53 gaseous planet 53 elongated orbit 53 cesium atom 53 geosynchronous orbit 53 phonon 53 angular momentum 53 vorticity 53 quasiparticle 53 gravitational redshift 53 mT 53 thermodynamic equilibrium 53 Nernst 53 Galilean satellites 53 planetary 53 extragalactic 53 longwave radiation 53 sunward 53 WISE spacecraft 53 filamentary structure 53 hydrostatic equilibrium 53 moonlet 53 luminous galaxies 53 astrometric 53 magnetisation 53 W boson 53 satellites orbiting Earth 53 Circinus X 1 53 Earth orbiting satellites 53 Foton M3 53 RY Sagittarii 52 zodiac constellations 52 earths surface 52 Convection Rotation 52 geostationary 52 planets Uranus 52 magnetospheric 52 thermal inertia 52 GJ #b [002] 52 Earth orbit LEO 52 Titan flyby 52 -# ° C. [002] 52 geo stationary satellites 52 Galilean moons 52 pericentre 52 azimuths 52 Oort cloud 52 angular velocity 52 electromagnetic flux 52 planet Gliese #c 52 protoplanet 52 TrES 4 52 Saturnian moons 52 Kuiper Belt Object 52 thermal equilibrium 52 superluminal 52 eccentric orbits 52 Ulysses spacecraft 52 earth orbiting satellites 52 binary asteroid 52 planets asteroids 52 quantum particle 52 asteroid flyby 52 hadron 52 hypersonic speeds 52 fiery reentry 52 LADEE 52 heavier payloads 52 illuminance 52 hypervelocity 52 occultation 52 gravitational perturbations 52 anisotropy 52 Oort Cloud 52 OSIRIS REx 52 equatorial bulge 52 Saturn moon Mimas 52 Plutoids 52 Toutatis 52 protoplanetary 52 Tempel Tuttle 52 Cepheid variables 52 SES Americom AMC 52 Solar TErrestrial RElations Observatory 52 optical wavelengths 52 LAGEOS 52 lunar perigee 52 radiative cooling 52 LRO spacecraft 52 interferometers 52 dipolar 52 tropical latitudes 52 subsurface ocean 52 spacecraft 52 Kepler 9b 52 transiting planet 52 celestial mechanics 52 waning crescent Moon 52 Shepherding Spacecraft 52 Gamma ray burst 52 luminosities 52 gravitational lenses 52 magnetic flux 52 Mössbauer 52 orbiting 52 comet chaser 52 COROT 52 Jovian moon 52 elliptical polar 52 coronal loop 52 Doppler shifts 52 particle analyzers 52 lidar instrument 52 electric ion propulsion 52 ballistic trajectories 52 spacecraft orbited 52 largest moon Charon 52 OGLE TR #b 52 microwave radiometers 52 trans Neptunian objects 52 galaxy M# [001] 52 Ultraviolet Imaging Spectrograph UVIS 51 dynamical 51 backshell 51 gradiometer 51 volcanic moon Io 51 sized planets orbiting 51 Proxima Centauri 51 Venusian atmosphere 51 precessing 51 retrorockets 51 steering wheel tilts 51 KAGUYA 51 Curiosity rover 51 subvertical dip 51 comets asteroids 51 Ocean Salinity 51 quantum superposition 51 radial velocity 51 NFIRE satellite 51 Neptune Uranus 51 Planetary Transits 51 solar corona 51 Rosetta orbiter 51 Hipparcos 51 Venusian 51 YORP effect 51 orbits Saturn 51 fluid viscosity 51 lunar crust 51 radial velocity technique 51 linear polarization 51 submillimeter wavelength 51 spacecraft Chandrayaan 1 51 millisecond pulsar 51 neutron spectrometer 51 transiting planets 51 moon Io 51 telescopic observations 51 intrinsic brightness 51 Zeta Ophiuchi 51 Jupiter magnetosphere 51 planetary magnetospheres 51 radial velocity method 51 ion thruster 51 MG J# +# 51 photometry 51 WASP #b 51 tidal bulge 51 #C #F [003] 51 obscuration 51 gravities 51 electron ion 51 electron flux 51 Flyby spacecraft 51 dynamical evolution 51 AU Mic 51 synchronous polar 51 Earth ionosphere 51 galactic cosmic rays 51 GALEX 51 blackbody 51 relativistic particles 51 innermost planet 51 sodium atoms 51 crustal thickness 51 antineutrinos 51 exosolar planets 51 rotational symmetry 51 CMB radiation 51 ms -1 51 magnetic excitations 51 terra forming 51 gamma rays emitted 51 Upsilon Andromedae b 51 waxing crescent 51 radar altimeter 51 lowermost mantle 51 gravitational wobbles 51 circumstellar 51 Pleiades cluster 51 Z boson 51 Solar Orbiter 51 polarimetric 51 Yinghuo 1 51 Mercury magnetosphere 51 Skynet 5C 51 interstellar dust grains 51 geo synchronous transfer 51 HD#b 51 Kepler #b 51 supercooled liquid 51 interstellar boundary 51 Mercury Uranus 51 Cepheids 51 X ray observatory 51 impactors 51 km perigee 51 orbited Jupiter 51 Relations Observatory STEREO 51 Earth orbit 51 planet orbits 51 smallest exoplanet 51 propulsion subsystem 51 Galileo constellation 51 constellation Eridanus 51 Phobos Grunt 51 gaseous planets 51 diurnal cycle 51 amu 51 unpressurized 51 Venus Climate Orbiter 51 circularly polarized light 51 deorbiting 51 moons circling 51 mesosphere 51 constellation Ursa Major 50 Rosetta spacecraft 50 planet magnetosphere 50 coriolis 50 Henize #-# 50 celestial bodies 50 circumstellar disks 50 occulted 50 -# º C [002] 50 asteroidal 50 lattice vibrations 50 lander Philae 50 waning crescent 50 Rockot launcher 50 A# modular 50 Keplerian 50 Highly Adaptable Satellite 50 highly collimated 50 polar orbits 50 magma ocean 50 imaging spectrometer 50 ion propulsion 50 XO 3b 50 polar latitudes 50 Alphabus 50 mK 50 cometary impacts 50 unpowered glider 50 xenon propellant 50 comet #P/Churyumov-Gerasimenko 50 sphericity 50 submillimetre wavelengths 50 reflection nebula 50 -# ° C [001] 50 Meanwhile preheat oven 50 constellation Cepheus 50 periodicities 50 manned spaceships 50 supergiant star 50 Capricornus 50 Iridium satellites 50 antiproton 50 #kt #km h 50 tidally 50 ENVISAT 50 HM Cancri 50 SMBH 50 permanently shadowed craters 50 NASA EPOXI mission 50 Cassini flyby 50 radiosonde 50 Jupiter Saturn 50 -# degrees Fahrenheit [002] 50 Europa Orbiter 50 CoRoT 50 Shackleton Crater 50 downwelling 50 Uranian 50 geo synchronous orbit 50 heliospheric 50 UV photons 50 -# deg [002] 50 outermost planet 50 Gaussian distribution 50 quadrupole 50 -# degrees Celsius [001] 50 baryonic 50 Envisat ASAR 50 P Churyumov Gerasimenko 50 zodiacal constellations 50 poleward 50 orbital insertion 50 gamma ray observatories 50 Gliese #e 50 gluon 50 CoRoT 7b 50 Doppler shift 50 astrophysical objects 50 tidally locked 50 electric dipole 50 submillimeter 50 photosphere 50 Makemake 50 Earthlike planet 50 nebular 50 OGLE TR 50 shepherding spacecraft 50 HiRISE image 50 Michelson interferometer 50 equatorial 50 probe Chang'e 50 extrasolar worlds 50 spacecraft flyby 50 Mott insulator 50 particle acceleration 50 troposphere 50 X ray emitting 50 beamwidth 50 Herbig Haro 50 swingby 50 planetary rovers 50 supersymmetric particles 50 τ 50 Epoxi 50 planet Uranus 50 Pegasus XL 50 mineralogical composition 50 polar orbit 50 Deep Impact eXtended Investigation 50 Jupiter Uranus 50 Spectrograph 50 P/# A2 50 gamma ray spectrometer 50 meridional flow 50 Jovian planets 50 -# ° Celsius [001] 50 GeV 50 hypersonic missiles 50 BLG #L 50 photoelectron 50 cantilever deflection 50 brightnesses 50 umbral shadow 50 inertial measurement 50 polaritons 50 meteoroid 50 Earth magnetotail 50 scatterometer 50 Konacki 50 transiting exoplanet 50 CoRoT 9b 50 polarimetry 50 microquasar 50 redock 50 tropopause 50 polar mesospheric clouds 50 inertial measurement unit 50 TNOs 50 nonzero 50 satelites 50 coplanar 50 STSS Demo 50 kg payload 50 planetary atmospheres 50 magnetization 50 Tau Ceti 50 shunt resistor 50 Orientale Basin 50 solar irradiance 50 microphysical 50 FWHM 50 moonquakes 50 moon gravitational pull 50 fainter objects 50 homochirality 50 backscattered 50 EPOCh 50 mineralogical mapping 50 cosmic phenomena 50 moons orbiting 50 relativistic electrons 50 Uninhabited Aerial Vehicle 50 galactic magnetic 50 moon Charon 50 Earth rotational axis 50 deg 50 upper troposphere 50 SMOS 50 spatially resolved 50 radio occultation 50 HiRise camera 50 polar vortex 50 ionospheric 50 Uranus Neptune 50 Geminga 50 thermally induced 50 planetoid 50 chondrites 50 antineutrino 50 Space ENvironment GEochemistry 50 equator 50 rotationally symmetric 50 Giovanni Cassini 50 Delta Cephei 50 wavefronts 50 Earth axial tilt 49 Triangulum 49 supercooling 49 constellation Aquarius 49 breathing scramjet engine 49 z = 49 +# deg [002] 49 star Proxima Centauri 49 HEO payloads 49 nucleon 49 compass needle 49 orbiting gamma ray 49 Hellas Basin 49 Cassini spacecraft orbiting 49 atmospheric circulations 49 NAVSTAR Global Positioning System 49 Corot 7b 49 Atlantis Undocks From 49 spacecraft orbiting 49 Cosmic Microwave Background 49 west longitude 49 Jules Verne ATV 49 #:# GMT 49 Cometary 49 tropical troposphere 49 superpositions 49 resolution panchromatic 49 cm sec 49 moon Phobos 49 constellation Aquila 49 • LA CYGNE 49 nmi 49 polarimeter 49 Express orbiter 49 altitudinal 49 speckle pattern 49 Kelvins 49 ephemeris 49 orbiter Mars Odyssey 49 hyperspectral imagery 49 Higgs bosons 49 periodic dimming 49 silicon monoxide 49 Insat 3A 49 SkyRouter 49 heavily cratered 49 latitudinal 49 AMSR E 49 collisional 49 STEREO spacecraft 49 EPOXI spacecraft 49 Earth magnetosphere 49 ESO telescope 49 VIRTIS 49 inertial guidance 49 LCROSS spacecraft 49 storable propellants 49 SCIAMACHY 49 LSAM 49 heliopause 49 TerraSAR X satellite 49 constellation Cygnus 49 isotherm 49 cosmic cannibal 49 infrared telescopes 49 NASA ICESat 49 interferometer 49 situ measurements 49 geo stationary 49 emissivity 49 Geosynchronous orbit 49 J# +# [002] 49 groundspeed 49 AB Aurigae 49 Terrestrial Planet Finder 49 ARPES 49 boresight 49 hydrazine thrusters 49 hyperfine 49 SNe Ia 49 auroral activity 49 Climate Experiment GRACE 49 circumlunar 49 parsec 49 AGNs 49 magnetic anisotropy 49 temperature gradients 49 VY Canis Majoris 49 millimeter wavelengths 49 asteroid Steins 49 Saturn outermost 49 Sky MAXX 49 spaceborne 49 wavefront distortion 49 Cloud Aerosol Lidar 49 Giove B 49 isotherms 49 hydroxyl molecules 49 ionosphere 49 retrograding 49 radiative transfer 49 planetoids 49 Mars landers 49 Arabsat 5A 49 Tunguska asteroid 49 asteroids orbiting 49 Venusian surface 49 sunlike stars 49 outer planets 49 satellites orbiting 49 lensing galaxy 49 Dirac fermions 49 stratospheric clouds 49 photon flux 49 Saturn outermost moon 49 plutoids 49 Olympus Mons 49 S/# P2 49 Fregat upper stage 49 infrared wavelength 49 thrust vectoring 49 planemos 49 Fornax cluster 49 thermal gradients 49 radiometer 49 exo atmosphere 49 #deg C 49 orbiter Cassini 49 Earth biosphere 49 RX J# 49 extraterrestrial civilizations 49 Descent Imager Spectral Radiometer 49 upper tropospheric 49 mantling 49 quasiparticles 49 moon Mimas 49 navigate autonomously 49 ultracold temperatures 49 millimeter wavelength 49 ASTRA 1KR 49 cosmological parameters 49 radiosondes 49 geosynchronous transfer orbit 49 mineral olivine 49 ENAs 49 X ray wavelengths 49 Advanced EHF satellite 49 Diviner 49 meV 49 Viking Lander 49 geosynchronous orbit GEO 49 geostationary earth 49 atmospheric turbulence 49 proto planetary disk 49 bi axial 49 martian atmosphere 49 multiwavelength 49 geostationary communications 49 Mars Pathfinder lander 49 Orbiter MRO 49 L5 signal 49 mu Arae 49 Einstein theories 49 supercontinuum generation 49 smallest extrasolar planet 49 enters lunar orbit 49 Planck satellite 49 Valles Marineris canyon 49 protoplanets 49 ultraviolet spectrograph 49 robotic explorer 49 meson 49 fundamental constants 49 spectrometric 49 W3B 49 Earth Orbit LEO 49 -# ° [002] 49 polar orbiting satellites 49 CoRoT satellite 49 comet orbital 48 GJ #b [001] 48 spectroscopic measurements 48 -# degrees centigrade [001] 48 Nasa spacecraft 48 # Apophis 48 Phoebe orbits 48 Libra constellation Vogt 48 Moon Mineralogy Mapper M3 48 detect gravitational waves 48 ferroelectricity 48 Keck telescopes 48 planetesimal 48 volcanic aerosols 48 Ranging spacecraft 48 Boltzmann constant 48 lander rover 48 outermost planets 48 z axis 48 COROT exo 3b 48 Anik F3 48 2 MeV electron 48 hundred thousandth 48 propellant tanks 48 Bessel beam 48 diffuse aurora 48 Gerhard Schwehm 48 Comet Hartley 2 48 gamma ray observatory 48 SMBHs 48 VB #b 48 Intelsat IS 48 Arecibo radar 48 moon Deimos 48 Mars Reconnaissance Orbiter MRO 48 radiative 48 S/# [001] 48 Saturn magnetosphere 48 W bosons 48 NASA MESSENGER spacecraft 48 volcanic plumes 48 mere fly bys 48 DMSP F# 48 Solid Rocket Boosters 48 dI dV 48 substorm 48 asteroid orbit 48 Virgin Galactic unveils 48 observables 48 spectroscopically 48 extrasolar planetary 48 trine 48 permanently shadowed regions 48 basaltic rocks 48 electronic excitations 48 Extraterrestrial UFOs 48 constellation Hercules 48 twin STEREO spacecraft 48 GOES O 48 regolith 48 parabolic trajectory 48 earthlike 48 lunar module Eagle 48 ion traps 48 NFIRE 48 advection 48 DIXI 48 retrogrades 48 ellipsoids 48 orbiting planets 48 Newtonian gravity 48 elemental composition 48 observing satellites 48 wavefunction 48 penumbral shadow 48 baryonic matter 48 longitudes 48 Beta Pictoris b 48 Saturn Uranus 48 perilune 48 Magnetars 48 Uranus Jupiter 48 martian 48 hPa 48 mantle plumes 48 celestial phenomena 48 quantum oscillations 48 Mars Phobos 48 Uranus 48 Keck Telescopes 48 total solar irradiance 48 Fregat 48 remote sensing instruments 48 silicate dust 48 PID controller 48 X ray telescopes 48 ARCTUS 48 electron proton 48 LEOP 48 linearly polarized light 48 cryogenic temperatures 48 JCSAT 9 48 ultracold atoms 48 auroral emissions 48 Jupiter flyby 48 gaussian 48 ultraprecise 48 spectrographs 48 gravitational attraction 48 ultraviolet wavelengths 48 C1XS 48 payload 48 magnons 48 ExoMars rover 48 orbital altitudes 48 cosmic ray particles 48 asymptotically 48 Syrtis Major 48 lithospheric 48 magnetic permeability 48 microlensing events 48 dwarf spheroidal 48 nanomesh 48 rotates clockwise 48 planets constellations 48 Mars Uranus 48 active galactic nucleus 48 blazar 48 unpolarized 48 Saturnian moon Titan 48 electronvolts 48 Bose Einstein condensates 48 Muchachos Observatory 48 Elenin 48 Gemini constellation 48 specular reflection 48 infrared astronomy 48 micrometre sized 48 lunar highlands 48 asteroids comets 48 Neutron Spectrometer 48 gravitational tugs 48 multipartite entanglement 48 velocities 48 Vega launcher 48 MetOp 48 experimental payloads 48 globular cluster 48 Agulhas Current 48 Alycia Weinberger 48 scanning electron microscopes 48 Glonass K 48 Helioseismic 48 drilled northwards 48 Itokawa 48 extrasolar planetary systems 48 impedance measurements 48 Martian terrain 48 neutralinos 48 gamma ray emission 48 micrometer scale 48 NextSat 48 galactic cosmic ray 48 neutron radiation 48 eclipsing binaries 48 millisecond pulsars 48 Mini TES 48 MUOS satellite 48 asteroid Itokawa 48 Red Rectangle 48 optical sectioning 48 polar craters 48 magnetic gradiometer 48 superheavy elements 48 Cygnus Lyra region 48 electro optical sensor 48 Long Wavelength Array 48 radiometric measurements 48 Martian polar 48 telescope orbits 48 lunar landers 48 JIMO 48 -# degrees Celcius