Related by context. All words. (Click for frequent words.) 79 rocky planets 74 habitable planets 72 planets 72 habitable zones 70 Earthlike planets 70 brown dwarfs 69 planets orbiting 68 super Earths 68 dwarf galaxies 67 protoplanetary disk 67 globular clusters 67 potentially habitable planets 67 planetary nebulae 67 extrasolar 66 hot Jupiters 66 Kuiper belt objects 66 protoplanetary disks 65 organic molecules 65 merging galaxies 65 extrasolar planetary systems 65 sunlike stars 65 galaxies 65 interstellar clouds 65 planets orbiting distant 65 Kuiper Belt Objects 65 habitable planet 65 WASP #b 64 exoplanets orbiting 64 exoplanets 64 supernovae 64 quasars 64 brown dwarf 64 stellar nurseries 64 Solar System 64 Kuiper belt 64 extrasolar planets 64 planetesimals 64 planet orbiting 64 KBOs 64 icy moons 64 globular cluster 64 solar nebula 64 chondrules 63 supernova explosion 63 supernova explosions 63 planemos 63 habitable worlds 63 starburst galaxies 63 Kuiper Belt objects 63 protoplanet 63 silicates 63 exoplanet 63 GRBs 63 Earthlike planet 63 Milky Way Galaxy 63 HD#b 63 transiting planets 63 elliptical galaxies 62 Milky Way galaxy 62 comets 62 chondrites 62 HD #b [002] 62 galaxy clusters 62 Upsilon Andromedae 62 gaseous planet 62 Epsilon Eridani 62 planets orbiting stars 62 Andromeda galaxy 62 Milky Way halo 62 moons orbiting 62 Beta Pictoris b 62 gaseous planets 62 potentially habitable 62 supermassive black holes 62 phyllosilicates 62 dwarf galaxy 61 asteroid belt 61 nebular 61 circumstellar disks 61 magnetars 61 inhabitable planets 61 circumstellar 61 Earthlike 61 neutron stars 61 Kuiper Belt 61 Hot Jupiters 61 habitable zone 61 red supergiant 61 protostar 61 Beta Pictoris 61 Wolszczan 61 GJ #b [001] 61 binary asteroids 61 protoplanets 61 globulars 61 nebulae 60 asteroidal 60 ULIRGs 60 exo planets 60 distant supernovae 60 BP Psc 60 gravitationally bound 60 eccentric orbits 60 galaxy formation 60 binary asteroid 60 Oort cloud 60 exoplanetary 60 protostars 60 red supergiants 60 biosignatures 60 gravitational interactions 60 planets orbiting sun 60 neutron star 60 carbonaceous chondrites 60 interstellar medium 60 hydrated minerals 60 magnetar 60 Pluto Charon 59 Earth asteroids 59 asteroids 59 sized planets orbiting 59 astronomical objects 59 planets orbits 59 tholins 59 TrES 4 59 spiral galaxies 59 prebiotic molecules 59 planet orbits 59 Oort Cloud 59 planetary nebula 59 planetary embryos 59 luminous galaxies 59 elongated orbits 59 proto galaxies 59 distant galaxies 59 X ray binary 59 supernovas 59 exoplanet orbiting 59 Gliese #d 59 astrobiologists 59 planetesimal 59 Gliese #c 59 asteroids comets 59 planet HD #b 59 Eta Carinae 59 Super Earths 58 Trojan asteroids 58 galaxy 58 noctilucent clouds 58 transiting planet 58 nucleosynthesis 58 radial velocity 58 outer planets 58 hypervelocity stars 58 carbonaceous chondrite 58 pulsars 58 Kuiper Belt object 58 metallicity 58 neutralinos 58 magnetosphere 58 Enceladus 58 Antennae Galaxies 58 Galilean moons 58 dirty snowballs 58 active galactic nuclei 58 nucleobases 58 supernova remnants 58 ejecta 58 interstellar cloud 58 GJ #b [002] 58 subsurface ocean 58 protoplanetary discs 58 reionization 58 supersymmetric particles 58 Neutron stars 58 Large Magellanic Cloud 58 redshifts 58 Gravitational waves 58 GJ#b 58 quasar 58 solar corona 58 comets asteroids 58 plutoids 58 extrasolar planet 58 elliptical galaxy 58 Omega Centauri 58 moonlet 58 photosphere 58 planets comets 58 permanently shadowed craters 58 circular orbits 58 gravitational microlensing 58 galaxy cluster 57 Corot 7b 57 Martian meteorites 57 Magellanic Clouds 57 interstellar dust clouds 57 accretion disks 57 X ray telescopes 57 Andromeda Galaxy 57 CAIs 57 galactic cosmic rays 57 planets circling 57 carbonate minerals 57 type Ia supernovae 57 planets moons 57 Earths orbiting 57 interstellar dust grains 57 exo planet 57 earthlike planets 57 circumstellar disk 57 SMBHs 57 supermassive 57 AB Aurigae 57 AGNs 57 planetoids 57 Type Ia supernovae 57 CoRoT 7b 57 interstellar dust 57 icy comets 57 neutrino 57 comets orbiting 57 exosphere 57 Orion Nebula 57 extrasolar planets orbiting 57 Corot 9b 57 proto planetary disks 57 Saturn moons 57 impactors 57 X ray wavelengths 57 Cancri e 57 accretion disk 57 dwarf planets 57 proplyds 57 prebiotic chemistry 57 planets asteroids 57 AU Mic 56 orbits 56 fainter objects 56 X ray emission 56 magma ocean 56 hydrogen helium 56 olivine 56 Gliese #g 56 WIMPs 56 gravitationally 56 nuclei 56 exosolar planets 56 Galilean satellites 56 distant quasars 56 retrograde orbit 56 planetary 56 galactic nuclei 56 supermassive black hole 56 Kepler #b 56 Cepheids 56 Meridiani 56 eclipsing binary 56 galactic clusters 56 gravitational perturbations 56 SN #gy 56 lunar crust 56 galactic disk 56 star Gliese 56 astrophysical 56 BP Piscium 56 moonlets 56 Fomalhaut b 56 proto planetary disk 56 COROT 56 transiting exoplanets 56 retrograde orbits 56 innermost planet 56 Type Ia 56 Globular clusters 56 carbonate globules 56 blue supergiant 56 globular star 56 P/# A2 56 Higgs particle 56 Henize #-# 56 Jupiter moon Io 56 Milky Way 56 hematite mineral 56 chromosphere 56 HL Tau 56 CoRoT 9b 56 Kepler 9c 56 magnetic monopoles 56 gravitational waves 56 eclipsing binaries 55 sodium atoms 55 Bok globules 55 planetary orbits 55 protoplanetary 55 Cancri 55 spherules 55 Spitzer Space Telescope 55 heliosphere 55 antiparticle 55 Goldilocks zone 55 gravitational interaction 55 constellation Taurus 55 pulsar 55 Higgs bosons 55 X ray binaries 55 electron neutrinos 55 trans Neptunian objects 55 ultraviolet wavelengths 55 planet Gliese #c 55 Saturn rings 55 plutons 55 radioactive nuclei 55 elliptical orbits 55 magnetospheric 55 microlensing 55 Red Rectangle 55 Hubble observations 55 silicate dust 55 galactic mergers 55 distant galaxy 55 Charles Beichman 55 ultracold atoms 55 masers 55 SN#A 55 orbiting planets 55 planets Uranus 55 supergiant star 55 redshift 55 occultations 55 axions 55 VY Canis Majoris 55 stony meteorites 55 equatorial regions 55 Eagle Nebula 55 high redshift galaxies 55 quark gluon plasma 55 J# +# [002] 55 Quaoar 55 Orion nebula 55 millisecond pulsars 55 stromatolites 55 Saturn Enceladus 55 jarosite 55 starburst galaxy 55 Small Magellanic Cloud 55 volcanism 55 silicate minerals 55 kaons 55 gravitational lenses 55 meteoritic material 54 baryon 54 planet WASP #b 54 sunlike star 54 TrES 54 Alpha Centauri 54 infrared wavelengths 54 stellar occultations 54 millisecond pulsar 54 supernova 54 type Ia supernova 54 asteroid Ceres 54 heavily cratered 54 Microlensing 54 Venusian atmosphere 54 aurorae 54 meteorite impacts 54 SMBH 54 supersymmetry 54 planetary astronomy 54 CoRoT #b 54 Jovian moons 54 HII regions 54 exoplanetary systems 54 substorms 54 Goldilocks planet 54 supergiant stars 54 homochirality 54 antiparticles 54 diffuse aurora 54 Wolf Rayet stars 54 SN #A 54 RRATs 54 Pluto Eris 54 coronal mass ejections CMEs 54 planetary atmospheres 54 rocky terrestrial planets 54 superfluids 54 tau neutrinos 54 active galactic nucleus 54 meteor impacts 54 moon Europa 54 gamma ray bursts 54 nebula 54 astrobiological 54 Bug Nebula 54 X ray observatories 54 asteroid 54 weakly interacting 54 blazars 54 ALH# 54 planets astronomers 54 HD# [002] 54 celestial object 54 baryons 54 planets circling stars 54 Exoplanets 54 coronal loops 54 Earth magnetosphere 54 PZ Tel 54 astronomers 54 cosmological models 54 astrophysical objects 54 Triangulum 54 Type Ia supernova 54 Bruce Jakosky 54 moon Enceladus 54 IntergalaticEarth 54 Sedna 54 OGLE TR #b 54 infalling 54 astrophysical phenomena 54 COROT 7b 53 Io Europa 53 superfluid 53 basaltic rocks 53 detect gravitational waves 53 gravitational tugs 53 moon Ganymede 53 gravitational wave 53 Evolution Explorer 53 dynamical evolution 53 zodiacal dust 53 Virgo cluster 53 supernova remnant 53 mesosphere 53 Europa Ganymede 53 spherically symmetric 53 Wolf Rayet star 53 constellation Hercules 53 lensing galaxy 53 pre biotic 53 meteorites 53 Type Ia supernovas 53 lunar craters 53 ecliptic plane 53 highly elliptical orbits 53 tidally locked 53 boson 53 mantle plumes 53 hydrogen atoms 53 spiral galaxy 53 novae 53 extremophiles 53 planet Gliese #g 53 Jupiter icy moons 53 cometary 53 Mimas 53 magnetic fields 53 ionized gas 53 post perovskite 53 nucleons 53 R#a# 53 smallest exoplanet 53 CoRoT 53 #P/Churyumov-Gerasimenko 53 Earths 53 spiral nebulae 53 interstellar space 53 Kuiper belt object 53 TNOs 53 CoRoT satellite 53 giant gaseous planets 53 isotopic compositions 53 Cepheid variables 53 abundances 53 GALEX 53 IRC +# 53 Smithsonian astronomer 53 atoms 53 neutralino 53 supermassive stars 53 Bose Einstein condensates 53 crystalline silicates 53 nanobacteria 53 magnetotail 53 interstellar grains 53 Mini TES 53 cosmic phenomena 53 supersymmetric 53 microlensing events 53 infall 53 primitive meteorites 53 spectral fingerprints 53 sterile neutrino 53 Saturnian moons 53 R Coronae Borealis 53 Neptune Uranus 53 comet 53 aerosol particles 53 Agol 53 gravitational radiation 53 filamentary structure 53 sulfate salts 53 exoplanets planets 53 Fornax cluster 52 missing baryons 52 Cosmic Microwave Background 52 faintest galaxies 52 SDSS II 52 exoplanet atmospheres 52 Triangulum Galaxy 52 Martian microbes 52 mineral olivine 52 accreting 52 Saturn magnetosphere 52 Comet Tempel Tuttle 52 dimming starlight 52 Tau Ceti 52 phonons 52 G#.# +#.# 52 Jovian moon 52 Kazantzidis 52 spectroscopic observations 52 Betelgeuse 52 submillimeter galaxies 52 GQ Lupi 52 magnetic reconnection 52 Fomalhaut 52 planetary surfaces 52 Konacki 52 mu Arae 52 Fermi telescope 52 constellation Virgo 52 high temperature superconductors 52 distant supernovas 52 SN #C 52 magmas 52 exoplanets planets outside 52 constellation Ursa Major 52 Supernovae 52 Virgo Cluster 52 extragalactic 52 meteoroids 52 Uranus Neptune 52 undersea volcanoes 52 Caloris 52 Iapetus 52 supercontinent 52 Epsilon Indi 52 gamma ray burst 52 celestial bodies 52 dynamical processes 52 jovian 52 Mandushev 52 periodic dimming 52 radial velocity technique 52 dimers 52 faint galaxies 52 comet McNaught 52 Veil Nebula 52 galactic halo 52 lavas 52 spectroscopic 52 YORP effect 52 supergiants 52 extrasolar planetary 52 Upsilon Andromedae b 52 superheavy elements 52 rotating neutron stars 52 neutrinos 52 primitive organisms 52 Lunine 52 mesons 52 Zeta Ophiuchi 52 Galaxy Evolution 52 Martian craters 52 Type 1a supernovae 52 Cosmic rays 52 moon Mimas 52 Ring Nebula 52 Astronomers 52 pyroxene 52 planet transits 52 intrinsic brightness 52 martian meteorites 52 Murchison meteorite 52 asteroid Vesta 52 Maunder minimum 52 Extrasolar planets 52 Mojzsis 52 Proxima Centauri 52 APXS 52 Gamma ray bursts 52 continental crust 52 quasicrystals 52 galaxy M# [002] 52 photosynthetic organisms 52 Jupiter Ganymede 52 Galaxies 52 chemical abundances 52 silicon monoxide 52 archaea 51 Galactic cosmic rays 51 TW Hydrae 51 Coma Cluster 51 Pluto moon Charon 51 Perseus Cluster 51 tungsten isotopes 51 morphologies 51 Alfven waves 51 cosmic microwave background 51 interstellar molecules 51 Gliese 51 Jupiter Saturn Uranus 51 inner asteroid belt 51 asteroids orbiting 51 organic compounds 51 osmium 51 hydrosphere 51 cosmic cannibal 51 ionized hydrogen 51 gravitational attraction 51 luminosities 51 Astrophysics Cambridge Mass. 51 #gy 51 BLG #Lb 51 galaxies collide 51 Kepler 9b 51 constellation Cassiopeia 51 VB #b 51 cosmological distances 51 prokaryotes 51 lifeforms 51 hematite 51 mineralogical composition 51 galactic cores 51 constellation Cetus 51 Eridani 51 chondritic 51 HAT P 51 moons Phobos 51 nicknamed Xena 51 Arches Cluster 51 magnetospheres 51 antineutrinos 51 moon Io 51 planet Uranus 51 Sagittarius B2 51 cosmic rays 51 planets atmospheres 51 hydrides 51 Comet Elenin 51 giant elliptical galaxies 51 Saturn moon 51 SIRTF 51 leptons 51 blue straggler 51 B mesons 51 Earth ionosphere 51 hydrothermal vent 51 eukaryote 51 B meson 51 gamma ray emission 51 Stephan Quintet 51 Crab Nebula 51 NASA Kepler spacecraft 51 buckyballs 51 permanently shadowed 51 isotope fractionation 51 Archaea 51 hydrothermal vents 51 spatially resolved 51 Dwarf galaxies 51 planetary transits 51 WHIM 51 Higgs boson particle 51 fermion 51 moon Charon 51 electron pairs 51 stellar occultation 51 sulfur isotope 51 KH #D 51 Doradus 51 Laser Interferometer Gravitational Wave 51 CMB radiation 51 moons 51 Syrtis Major 51 muons 51 methanogens 51 atomic nuclei 51 polar caps 51 Uranus 51 optical telescopes 51 neutrino detectors 51 Saturnian moon 51 chondritic meteorites 51 XMM Newton 51 olivine mineral 51 orbiting 51 planetary scientist 51 iron pnictides 51 cometary material 51 substorm 51 dwarf spheroidal 51 galactic collisions 51 Carina constellation 51 Pulsars 51 polaritons 51 meteoroid impacts 51 lunar meteorites 51 Gliese #e 51 spherical halo 51 Planetary nebulae 51 spectral signatures 51 intracluster 51 brightest supernova 51 Asteroid Belt 51 outermost planets 50 atmospheric oceanic 50 orbital resonance 50 RHESSI 50 quantum particle 50 Rossby waves 50 HIP #b 50 unconventional superconductivity 50 polarimetry 50 igneous rocks 50 BLG #L 50 Pleiades cluster 50 Dumbbell Nebula 50 Astrophysicists 50 topological insulators 50 NEAs 50 HM Cancri 50 Nikku Madhusudhan 50 lunar regolith 50 presolar 50 hydrothermal activity 50 Seyfert galaxies 50 biosignature 50 distant galaxy clusters 50 GeV 50 antihelium 4 50 globular cluster M# 50 SUSY 50 Orionids 50 neutrino mass 50 photosynthetic microbes 50 observable universe 50 constellation Aquarius 50 optical wavelengths 50 forams 50 Tarantula Nebula 50 cuprates 50 moon Mab 50 XO 3b 50 unicellular organisms 50 outermost planet 50 Elliptical galaxies 50 Jupiter Saturn 50 PSR B# +# 50 Magnetars 50 planetary geologists 50 Valles Marineris 50 CMEs 50 fermions 50 Gal Yam 50 VHE gamma rays 50 comet nuclei 50 ionise 50 Jupiter magnetosphere 50 W boson 50 radial velocity method 50 Pegasi 50 Churyumov Gerasimenko 50 covalent bonds 50 Milankovitch cycles 50 planetoid 50 galactic magnetic 50 Keck Interferometer 50 silicate mantle 50 Late Heavy Bombardment 50 constellation Scorpius 50 plutoid 50 geoneutrinos 50 collisional 50 gravitational pulls 50 geomagnetic storms 50 subatomic particle 50 tidal tails 50 Sagittarius dwarf galaxy 50 strange quark 50 lava tubes 50 bosonic 50 electron pairing 50 isotopic ratios 50 dusty disks 50 Svedhem 50 interacting galaxies 50 polar vortex 50 asterism 50 constellation Libra 50 ferric oxides 50 coronagraph 50 largest moon Charon 50 Cassini ion 50 AUs 50 convective 50 cosmological theories 50 relativistic particles 50 silicate crystals 50 high temperature superconductivity 50 submillimeter 50 HD# [005] 50 iron oxides 50 spectroscopically 50 strangelets 50 cosmic strings 50 baryonic matter 50 Grillmair 50 supernovae explode 50 presolar grains 50 Sasselov 50 gaseous envelope 50 nanohorns 50 colliding galaxies 50 constellation Carina 50 De Pontieu 50 plagioclase 50 Active Galactic Nuclei 50 dust enshrouded 50 Stephane Udry 50 Gamma rays 50 galaxy NGC 50 elongated orbit 50 gravitational tides 50 SN #E 50 gamma ray observatory 50 z ~ 50 Lunar Prospector 50 extraterrestrial civilizations 50 constellation Centaurus 50 melanosomes 50 starquakes 50 Hale Bopp 50 Hyades 50 zodiacal light 50 Jonathan Lunine 50 nebulosity 50 Trapezium 50 Andromeda halo 50 unicellular 50 carbonaceous meteorites 50 asteroseismology 50 Carina Nebula 50 Higgs Boson 50 Alfvén waves 50 chemical reactivity 50 amorphous calcium carbonate 50 mid latitudes 50 optical spectra 50 positrons 50 electrons orbiting 50 pseudogap 50 Toutatis 50 foraminifera 50 single celled microorganisms 49 thermonuclear reactions 49 Dauphas 49 supercontinents 49 gravitational lensing 49 asteroid impacts 49 perihelion 49 energetic cosmic rays 49 atomic particles 49 Gerard Kuiper 49 Orionid 49 Bose Einstein condensation 49 GRB #B 49 positronium 49 galactic bulge 49 Anthony Remijan 49 infrared telescopes 49 Cepheid variable 49 heliosheath 49 cluster NGC 49 comet nucleus 49 abiogenesis 49 Scorpii 49 polar craters 49 goethite 49 perturbations 49 Cabeus 49 infalling gas 49 TGFs 49 single celled 49 elemental abundances 49 graphite whiskers 49 carbonyl sulfide 49 molecules 49 placental mammals 49 dynamical 49 Avishay Gal Yam 49 elemental composition 49 constellation Sagittarius 49 HiRISE image 49 Saturn aurora 49 Trifid 49 deuterium atoms 49 adenine 49 Samuel Oschin Telescope 49 southern supercontinent 49 X ray emitting 49 morphological evolution 49 Exoplanet 49 celestial objects 49 supernova SN 49 electron neutrino 49 phyllosilicate 49 Delta Cephei 49 NGC# 49 axion 49 Haumea 49 transiting exoplanet 49 Uranian 49 hydroxyl 49 spectroscopic measurements 49 zircons 49 Submillimeter Array 49 ultraluminous galaxy 49 solar minima 49 star Beta Pictoris 49 Mercury magnetosphere 49 isotope ratios 49 Astrophysical 49 Martian surface 49 olivines 49 alien civilizations 49 mantle convection 49 Scheila 49 matter antimatter asymmetry 49 Saturn Uranus 49 Nili Fossae 49 MG J# +# 49 Gaensler 49 RX J# 49 Trifid Nebula 49 star Proxima Centauri 49 dwarf spheroidal galaxies 49 van Dokkum 49 nanoclusters 49 concretions 49 mineral hematite 49 meridional flow 49 stellar seismology 49 airglow 49 sterile neutrinos 49 sulfate aerosols 49 Sara Seager 49 Saturn moon Enceladus 49 multicellular animals 49 antimatter particles 49 helium atoms 49 cosmologists 49 spacetime 49 earths 49 Kuiper Belt Object 49 Cosmologists 49 Spiral galaxies 49 microplastics 49 solitons 49 oxygen isotopes 49 UDFy # 49 moon Titan 49 Thiemens 49 unaided eye 49 X ray Observatory 49 tidally 49 pions 49 Methone 49 particle detectors 49 antiferromagnets 49 hydrothermal 49 cosmological 49 microbialites 49 Earthly contamination 49 energetic electrons 49 S/# P2 49 particle acceleration 49 electrons protons 49 Diviner 49 Comet Holmes 49 Garth Illingworth 49 gravitational lens 49 hydrogen atom 49 hadrons 49 biominerals 49 metalloproteins