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(Click for frequent words.) 70 perihelion 70 lunar perigee 70 aphelion 65 elliptical orbit 64 circular orbit 61 slender crescent 61 planet orbits 61 constellation Aquarius 60 perigee closest 60 arcminutes 59 orbits 59 celestial equator 59 star Spica 59 supermoon 59 Eta Carinae 59 equinox 59 gaseous planet 59 highly elliptical orbit 58 thin crescent moon 58 arcseconds 58 elliptical orbits 58 waxing gibbous moon 58 waxing crescent 58 km perigee 58 Orionids 57 Eta Aquarid meteor shower 57 mesosphere 57 elongated orbit 57 gamma ray burst 57 waning crescent 57 autumnal equinox 56 Earth radii 56 constellation Ursa Major 56 waning gibbous moon 56 orbital velocity 56 Fomalhaut b 56 constellation Virgo 56 star Proxima Centauri 56 Quadrantid meteor shower 56 Titan flyby 56 super perigee moon 56 autumn equinox 56 Quadrantids 56 galaxy M# [001] 55 crescent Moon 55 Orionid meteor shower 55 orbital eccentricity 55 CoRoT #b 55 circularize 55 orbital inclination 55 geosynchronous orbit 55 Comet Holmes 55 heliopause 55 gibbous moon 55 WASP #b 55 Pleiades star 55 Comet Lulin 55 Yarkovsky effect 55 Capricornus 55 waning gibbous 55 tidally locked 55 Epsilon Aurigae 55 planet Uranus 55 celestial sphere 55 GJ#b 54 Comet Machholz 54 orbital resonance 54 occulted 54 GJ #b [002] 54 arcsecond 54 HD#b 54 Cancri e 54 Mpc 54 substorms 54 zodiacal light 54 Uranus 54 penumbral lunar eclipse 54 umbral shadow 54 apogee farthest point 54 Toutatis 54 ecliptic 54 Geminid meteor shower 54 asteroid Vesta 54 waxing gibbous 54 geo stationary orbit 54 TrES 4 54 HD #b [002] 53 orbit 53 vernal equinox 53 axial tilt 53 ringed planet 53 Lyrid meteor shower 53 penumbral eclipse 53 Leonid shower 53 innermost planet 53 Epsilon Eridani 53 umbral 53 transiting planet 53 Corot 9b 53 Leonids 53 Sun synchronous orbit 53 planet orbiting 53 occultations 53 polar orbit 53 Gliese #e 53 penumbral shadow 53 CoRoT 7b 53 Astronomical Units 53 constellation Sagittarius 53 Gliese #c 53 pericentre 53 sunspot cycle 53 #P/Churyumov-Gerasimenko 53 planets orbits 53 magnetar 53 retrograde orbit 53 arcsec 53 Lagrangian 53 mu Arae 53 Kepler 9c 53 Perseids 53 Geminids 53 closest flyby 53 sextile 53 Perseid Meteor Shower 53 Eta Aquarids 53 YU# 53 orbiting 53 Lyrids 52 gravitational lens 52 Virgo cluster 52 thin crescent 52 equinox occurs 52 constellation Leo 52 polar orbits 52 Earth axial tilt 52 Jupiter Uranus 52 red supergiant 52 millisecond pulsar 52 AU Mic 52 Comet Hartley 2 52 distant galaxy 52 BLG #Lb 52 auroral displays 52 geomagnetic activity 52 Vernal Equinox 52 spring equinox 52 HL Tau 52 GeV 52 orbits Saturn 52 Kepler #b 52 asterism 52 perigee moon 52 geostationary orbit 52 spokesman Jeff Cuson 52 planets Uranus 52 star Gliese 52 Leonid meteor showers 52 Itokawa 52 GA6 52 Churyumov Gerasimenko 52 celestial object 52 infrared wavelengths 52 magnetotail 52 # Apophis 52 Perseid shower 52 GRB # 52 gibbous 51 Kuiper Belt object 51 MErcury Surface Space ENvironment 51 elliptical galaxy 51 sun synchronous orbit 51 visible wavelengths 51 redshift 51 equatorial orbit 51 sunlike star 51 constellation Gemini 51 constellation Taurus 51 annularity 51 flyby spacecraft 51 constellation Auriga 51 Comet Hartley 51 Corot 7b 51 GZK cutoff 51 equinoxes 51 GJ #b [001] 51 occultation 51 Cassini flyby 51 stellar occultations 51 constellation Perseus 51 umbra 51 lunar orbits 51 Taurids 51 Cancri 51 Oort Cloud 51 waning crescent Moon 51 Saturn Cassini 51 elongated orbits 51 GRB #B 51 Proxima Centauri 51 CoRoT 51 Crab Nebula 51 entire Milstar constellation 51 GEochemistry 51 unaided eye 51 Comet NEAT 51 Goldilocks planet 51 SN #gy 51 SIRTF 51 extrasolar planet 51 perilune 51 coronal mass ejection 51 Geminid 51 Leonid meteors 50 supergiant star 50 constellation Aries 50 Saturn equinox 50 constellation Monoceros 50 constellation Hercules 50 Large Magellanic Cloud 50 Zeta Ophiuchi 50 cosmic ray protons 50 X ray pulses 50 Comet LINEAR 50 cosmic ray flux 50 smoothed sunspot number 50 constellation Andromeda 50 photosphere 50 constellation Libra 50 prograde 50 equator 50 Orionid meteors 50 asteroid Lutetia 50 magnetosphere 50 comet Hartley 2 50 cosmic cannibal 50 Orion Nebula 50 Perseids meteor shower 50 meteor shower 50 Sedna 50 Orionid 50 substorm 50 protoplanet 50 PSLV C6 50 lunar eclipse occurs 50 constellation Centaurus 50 foreground galaxy 50 smallest exoplanet 50 eclipsing binary 50 Antennae Galaxies 50 Puppis 50 waxing crescent moon 50 constellation Cassiopeia 50 HD #b [001] 50 gamma ray flares 50 SOHO spacecraft 50 Leonid meteor shower 50 Venusian surface 50 Comet McNaught 50 Betelgeuse 50 Upsilon Andromedae 50 brown dwarf 50 attosecond 50 meteoroid 50 heliosphere 50 SuperMoon 50 moons Phobos 50 Sriharikota spaceport 50 rotational axis 50 sodium atoms 50 comet nucleus 50 coronal hole 50 Oort cloud 49 starlike object 49 observable universe 49 GRBs 49 YORP effect 49 Earth orbit 49 Gliese 49 Dhanu Rashi 49 planetary Transits 49 Pleiades cluster 49 COROT 49 Jupiter Ganymede 49 submillimeter wavelengths 49 lunar orbit 49 dipole moment 49 exoplanetary 49 annular eclipse 49 XMM Newton 49 cosmic ray 49 Perseid meteor shower 49 sidereal 49 star Fomalhaut 49 Arches Cluster 49 STEREO spacecraft 49 microlensing 49 Lulin 49 spiral galaxy NGC 49 summer solstice 49 Upsilon Andromedae b 49 constellation Scorpius 49 galaxy cluster 49 galaxy NGC 49 sunspot activity 49 magnetic polarity 49 MN4 49 Autumnal Equinox 49 spiral galaxy 49 Samuel Oschin Telescope 49 Gamma Virginids shower 49 2 MeV electron 49 SKY WATCH 49 RY Sagittarii 49 orbital radius 49 Kuiper belt objects 49 constellation Cepheus 49 Deep Impact craft 49 Gamma Virginids 49 hundred thousandth 49 sunspot numbers 49 Geminid shower 49 ultraviolet wavelengths 49 Earth magnetosphere 49 Saturn Uranus 49 solar radii 49 Donald Yeomans 49 HIRES spectrometer 49 Eridani 49 RL# engine 49 INSAT 4CR 48 Comet Churyumov Gerasimenko 48 Saturnian moon 48 TU# [002] 48 Pleiades 48 redshifts 48 retrograde orbits 48 Fomalhaut 48 solar eclipse occurs 48 exoplanets 48 KBOs 48 Cepheids 48 GOCE 48 Triangulum 48 heliosheath 48 Beta Pictoris b 48 constellation Lyra 48 moonrise 48 Virgo Cluster 48 comets orbiting 48 comet Lulin 48 radial velocity 48 Geminid Meteor Shower 48 Andromeda Galaxy 48 geo synchronous orbit 48 femtoseconds 48 ray Space Telescope 48 electron flux 48 planetary nebula 48 Galilean moons 48 orbital altitude 48 ejecta 48 Mercury Uranus 48 Fermi telescope 48 exoplanet orbiting 48 Serpens Cauda 48 WD5 48 Kuiper belt 48 Geminid meteor showers 48 Cassini 48 Gliese #g 48 super Earths 48 elliptical polar 48 attoseconds 48 exoplanet 48 Iapetus 48 Galileo spacecraft 48 supernova explosion 48 predawn sky 48 Ulysses spacecraft 48 Olympus Mons 48 impactor 48 NFIRE satellite 48 Gravitational lensing 48 MESSENGER spacecraft 48 Geminga 48 Cassini Huygens spacecraft 48 Perseid shower occurs 48 Hubble orbits 48 astrometry 48 Uranian 48 Ringed Planet 48 lunar occultation 48 Uranus Neptune 48 gamma ray observatory 48 magnetic reconnection 48 Saturn magnetosphere 48 SMOS mission 48 brown dwarfs 48 cosmological distances 48 Planck satellite 48 gamma ray bursts 48 ecliptic plane 48 geo synchronous transfer 48 Foton spacecraft 48 Earthquake magnitudes 48 polar vortex 48 ionosphere 47 Lunar Reconnaissance Orbiter LRO 47 Henize #-# 47 Pluto Eris 47 RQ# 47 annular eclipse occurs 47 Shackleton crater 47 gravitational acceleration 47 moonlet 47 S/# S1 47 HM Cancri 47 GRB# 47 Hale Bopp 47 Phaethon 47 Type Ia supernova 47 magnetars 47 spacecraft 47 IBEX spacecraft 47 airglow 47 Astronomically speaking 47 Solar Terrestrial Relations 47 troposphere 47 AUs 47 Ranging spacecraft 47 RS Ophiuchi 47 icy moons 47 exosphere 47 Saturnian 47 Mimas 47 Enceladus 47 Perseus constellation 47 transiting planets 47 constellation Cetus 47 Earth rotational axis 47 X ray emission 47 Perseus cluster 47 Orionid Meteor Shower 47 constellation Carina 47 planet TrES 47 Comet Halley 47 Lyra constellations 47 Perseids Meteor Shower 47 Halley comet 47 GQ Lupi 47 jovian 47 planetary transits 47 spacecraft Cassini 47 optical wavelengths 47 flyby 47 Beehive Cluster 47 infrared telescope 47 Geosynchronous orbit 47 exoplanets orbiting 47 TrES 47 telescope orbits 47 PSR J# 47 zodiacal constellations 47 baryon 47 HARPS spectrograph attached 47 Plutoids 47 deorbit burn 47 highly elliptical orbits 47 comet orbit 47 moon Enceladus 47 galactic disk 47 velocity vector 47 Carina constellation 47 earthshine 47 Comet Tempel 1 47 resonance frequency 47 SN #A 47 starburst galaxies 47 GROND 47 Substorms 47 Saturn moons Titan 47 Lutetia 47 CoRoT satellite 47 Jupiter moon Io 47 parsec 47 Noctilucent clouds 47 solar minima 47 spatial dimensions 47 radial velocity method 47 Syrtis Major 47 interacting galaxies 47 Infrared Pathfinder Satellite 47 Huygens descent 47 protoplanetary disk 47 metallicity 47 Shutter speeds 47 Geminid meteors 47 VY Canis Majoris 47 Comet Elenin 47 constellation Bootes 47 telescope Uranus 47 pad #A 47 COROT 7b 47 Kuiper Belt Object 47 moonset 47 silicate dust 47 gravitational microlensing 47 geosynchronous 47 shepherding spacecraft 47 gravitational keyhole 47 arcmin 47 Saturn moon Mimas 47 Cassini spacecraft 47 Spring Equinox 47 BLG #L 47 New Horizons spacecraft 47 Lunar eclipse 47 gamma ray emission 47 gravitational slingshot 47 Martian moons 47 sievert 47 Winter solstice 47 luminous galaxies 47 navigate autonomously 46 AGNs 46 equatorial bulge 46 solstices 46 neutron star 46 Naro Space Center 46 -# degrees Fahrenheit [002] 46 comet #P/Churyumov-Gerasimenko 46 Uranus Jupiter 46 lunar equator 46 Leonid Meteor Shower 46 comet Tempel Tuttle 46 quasar 46 planetoid 46 Libra constellation Vogt 46 Cloud Aerosol Lidar 46 constellation Pegasus 46 Space ENvironment GEochemistry 46 protostar 46 galaxy M# [002] 46 planet WASP #b 46 antineutrinos 46 obscuration 46 geostationary orbits 46 GALEX 46 Kuiper Belt objects 46 Sagittarius B2 46 Muchachos Observatory 46 sunspot 46 Solar TErrestrial RElations Observatory 46 comet 46 Jovian moons 46 potentially habitable planets 46 autumn equinoxes 46 brightest supernova 46 asteroid 46 trine 46 Hindu almanac 46 muon 46 outermost planet 46 volcanic moon Io 46 tropopause 46 quantum superposition 46 Halley Comet 46 largest moon Charon 46 magnetopause 46 moon Charon 46 HiRISE image 46 thrusters 46 neutrino mass 46 orbit GEO 46 volcanic tremor 46 HARPS spectrograph 46 submillimetre wavelengths 46 Aurigae 46 magma ocean 46 Mars Odyssey spacecraft 46 globular cluster 46 orbit insertion 46 constellation Ophiuchus 46 Perseid meteor 46 antiparticle 46 Scorpius 46 S/# P2 46 comet Churyumov Gerasimenko 46 BepiColombo 46 perigee nearest point 46 Comet #P/Churyumov-Gerasimenko 46 galactic cosmic rays 46 imaging spectrometer 46 Pluto Charon 46 Saturn rings 46 Milky Way Galaxy 46 obliquity 46 constellation Cygnus 46 photometry 46 XTE J# 46 Bug Nebula 46 intrinsic brightness 46 SNe Ia 46 MARSIS 46 antineutrino 46 moon Ganymede 46 spatial resolution 46 P/# A2 46 Saturn moon Enceladus 46 solar nebula 46 luminosities 46 orbital 46 Spica 46 geoeffective 46 Apophis 46 Mars Uranus 46 type Ia supernova 46 suborbital trajectory 46 asteroid Itokawa 46 gravitational interaction 46 VLTI 46 Venus transits 46 Convection Rotation 46 Lunar Eclipse 46 aerobraking 46 Steins asteroid 46 cluster NGC 46 LCROSS 46 Supermoon 46 synchronous orbit 46 supernova remnant 46 ESA SMART 46 Beta Pictoris 46 Quadrantid 46 ESO VLT 46 SBSS satellite 46 detect gravitational waves 46 barred spiral galaxy 46 eccentric orbits 46 total solar irradiance 46 planet HD #b 46 preset orbit 46 noctilucent clouds 46 Achernar 46 exo planets 46 QQ# 46 Swift Tuttle 46 C1XS 46 Leonids meteor shower 46 RRATs 46 kelvin 46 MG J# +# 46 gaseous planets 46 Elenin 46 geosynchronous orbits 46 PSLV C# rocket 46 Red Rectangle 46 planets orbiting 46 UVOT 46 Hipparcos 46 Carinae 46 Pegasi 46 Venusian atmosphere 46 elliptical galaxies 46 moon Titan 46 PSLV C 46 southern constellation Carina 46 constellation Eridanus 46 Lagoon Nebula 45 LADEE 45 ultraviolet imaging spectrograph 45 Earth gravitational pull 45 X ray wavelengths 45 subatomic particle 45 Skynet 5C 45 swingby 45 Giovanni Cassini 45 KT boundary 45 Jupiter flyby 45 Dwarf Planet 45 orbiting Hubble Space Telescope 45 X ray observatory 45 slowly Adere 45 filamentary structure 45 aurorae 45 Jenniskens 45 circular polarization 45 STSS Demo 45 HD# [002] 45 Helix nebula 45 La Silla Chile 45 supernova SN 45 orbiting telescope 45 bullspread 45 microquasar 45 emission nebula 45 Earth magnetotail 45 Full Moons 45 geomagnetic field 45 constellation Ara 45 circular orbits 45 ballistic trajectory 45 Virginis 45 DigitalGlobe WorldView 45 Gamma ray bursts 45 NASA Stardust spacecraft 45 Perseid meteors 45 transiting exoplanet 45 -# degrees Celsius [001] 45 Kepler telescope 45 geosynchronous satellites 45 geosynchronous transfer 45 Lunar eclipses 45 exoplanets planets 45 Kazakhstan barren steppe 45 Perseid 45 starburst galaxy 45 Min temp 45 ESO Very Large Telescope 45 longwave radiation 45 meteor showers 45 fainter objects 45 outer corona 45 celestial phenomenon 45 SNR #-#.# 45 strange quark 45 #:# GMT 45 Gliese #d 45 Ring Nebula 45 Planetary Transits 45 permanently shadowed crater 45 Crab Pulsar 45 Kepler 9b 45 orbited 45 Launch Pad #B 45 KAGUYA 45 Quaoar 45 giant elliptical galaxy 45 Delta Cephei 45 MeV 45 moons Europa 45 Andromeda galaxy 45 LRO LCROSS 45 extrasolar planets 45 electron density 45 Earth asteroids 45 Type Ia 45 HiRISE camera 45 waning crescent moon 45 APXS 45 picosecond 45 Venus Uranus 45 orbiter Cassini 45 asteroid Steins 45 Anisotropy Probe 45 auroral activity 45 Triangulum Galaxy 45 tiny meteoroid 45 WISE mapped 45 Krishna Paksha 45 Relations Observatory STEREO 45 ENAs 45 Proba 2 45 eyepiece #/#s f/#.# 45 keV 45 reionization 45 carry heavier payloads 45 sub millimeter wavelengths 45 Shinmoedake 45 moon Io 45 Gravity Probe B 45 Aurigid 45 blazar 45 Fornax cluster 45 rocky planets 45 rover Spirit landed 45 orbit GTO 45 supernova 45 sun corona 45 orbital rendezvous 45 Cepheid variables 45 solar corona 45 meteoroids 45 velocity dispersion 45 Cassini Huygens 45 albedo reflectivity 45 deg 45 gravitational redshift 45 spherically symmetric 45 astronomers 45 HAT P 45 LAGEOS 45 heavily cratered 45 radio occultation 45 submillimeter wavelength 45 geomagnetic storms 45 Konacki 45 west longitude 45 aurora 45 Geminids meteor shower 45 Atlantis rocketed 45 Kuiper Belt Objects 45 Oceanus Procellarum 45 Messenger spacecraft 45 cosmic collisions 45 Manned missions 45 LCROSS spacecraft 45 Ed Weiler NASA 45 ionized gas 45 gravitational lensing 45 Roque de los 45 Saturnian system 45 Dean Pesnell 45 thrilling stargazers 45 Martian equator 45 PSLV rocket 45 gravitational perturbations 45 aspecting 45 Jules Verne ATV 45 hazardous eruption 45 Rosetta orbiter 45 SGR J# 45 geostationary transfer 45 geoid 45 milliarcseconds 45 Unha 2 45 galactic equator 45 CMB radiation 45 Wolf Rayet star 45 proto cluster 45 LORRI 45 meson 45 Chang'eI 45 moonquakes 45 Phobos 44 SMOS 44 electron volts 44 sized planets orbiting 44 Microlensing 44 Tempel Tuttle 44 gravitational interactions 44 Kuiper belt object 44 tidal bulge 44 KH #D 44 LASCO imagery 44 Omega Centauri 44 Enceladus flyby 44 Orientale Basin 44 Mars Phobos 44 Gemini constellation 44 orbiter 44 cosmic magnifying glass 44 meteors 44 Astronomically 44 Hanny Voorwerp 44 gravitational attraction 44 WISE spacecraft 44 globular clusters 44 geomagnetic 44 Jupiter Saturn 44 planemos 44 Mauna Kea Hawaii 44 annular solar eclipse 44 antiproton 44 Hot Jupiters 44 Lunar eclipses occur 44 energetic gamma rays 44 Orbiting 44 ESA Herschel 44 microlensing events 44 distant quasar 44 momentary gusts 44 weather satellite TIROS 44 trillionths 44 ST5 44 fist widths 44 cosmic microwave radiation 44 dwarf galaxy 44 IRAS #-# 44 Mandushev 44 Michibiki 44 Pirs Docking Compartment 44 RXTE 44 Observatory STEREO 44 parsecs 44 smallest extrasolar planet 44 Apophis asteroid 44 electron proton 44 baryonic 44 Shepherding Spacecraft 44 shorter wavelengths 44 blue supergiant 44 electron volt 44 photon energies 44 libration 44 θ 44 Cerro Paranal 44 ion thrusters 44 Imaging Spectroradiometer MODIS 44 nebula 44 reddish glow 44 asteroid Eros 44 Kepler spacecraft 44 Earth ionosphere 44 auroral oval 44 Astra 1L 44 Symptom onset 44 Hubble Constant 44 Cepheid variable 44 ion propulsion 44 Makemake 44 NROL 44 inhabitable planets 44 Meteor shower 44 sunspots 44 Saturn outermost moon 44 gravitationally 44 TGFs 44 Explorer WISE 44 Interior Laboratory GRAIL 44 spherical halo 44 Kepler observatory 44 outer planets 44 NASA Cassini spacecraft 44 Musudan ri 44 planets 44 Mercury retrograde 44 Small Magellanic Cloud 44 Tarantula Nebula 44 Meteor showers 44 PSLV 44 Space Environment Geochemistry 44 Mössbauer 44 VIRTIS 44 Extrasolar planets 44 Science Popularisation Association 44 extragalactic 44 THEMIS 44 Earth asteroids NEAs 44 Solar eclipses 44 MetOp 44 Charon Pluto 44 BP Piscium 44 STEREO mission 44 Krimigis 44 IceCube 44 ephemeris 44 Nasa spacecraft 44 Annular solar eclipse 44 magnetospheric 44 accretion disk 44 NOAA GOES 44 annual Perseid meteor 44 habitable zone 44 asteroids orbiting 44 N. Rathnasree 44 ephemeris features 44 Tanegashima Space Center 44 planet Gliese #g 44 chromosphere 44 Fregat upper stage 44 aperture telescope 44 lensing galaxy 44 -# º C [002] 44 SIM PlanetQuest 44 superheavy elements 44 Milstar II 44 spacecraft Chandrayaan 1 44 stellar occultation 44 Flyby 44 Arabsat 5A 44 ESA Integral 44 helium atoms 44 Earthlike planet 44 hypersonic speeds 44 planetary nebulae 44 fissure eruption 44 Keck telescope 44 UB# [003] 44 interplanetary spacecraft 44 probe Chang'e 44 Planck spacecraft 44 Coma Cluster 44 nsec 44 Grammier 44 MESSENGER 44 reflection nebula 44 planetary alignment 44 xenon propellant 44 Mars Neptune Uranus 44 NASA Aqua 44 comet Tempel 1 44 celestial objects 44 Hubble observations 44 G#.# +#.# 44 Harold Camping prediction 44 astronomical objects 44 hydrazine thrusters