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(Click for frequent words.) 70 astrobiological 65 astrobiology 62 Earthlike planets 62 biosignatures 61 habitable planets 60 shadow biosphere 60 moon Europa 60 extrasolar 60 Saturn Enceladus 59 icy comets 59 terrestrial planets 59 habitable worlds 59 subsurface ocean 58 Jovian moon 58 extrasolar planetary systems 58 Lunine 58 exoplanetary 58 permanently shadowed craters 58 prebiotic molecules 58 panspermia 58 Kuiper Belt Objects 58 Earthlike planet 58 Astrobiologists 58 Jupiter icy moons 57 Martian microbes 57 geochemists 57 icy moons 57 Martian meteorites 57 potentially habitable 57 rocky planets 57 Saturn moons 57 phyllosilicates 57 Galilean satellites 56 NASA astrobiology 56 cosmologists 56 astrobiologist 56 planetary geologists 56 prebiotic chemistry 56 Martian rocks 56 Wolszczan 56 Kounaves 56 planets atmospheres 56 planets orbiting distant 56 Earthlike 56 extrasolar planets 56 sterile neutrino 56 microbial ecosystems 56 hydrated minerals 56 tholins 56 scientists 56 Higgs boson particle 56 Bruce Jakosky 55 Antarctic Dry Valleys 55 extremophiles 55 organic molecules 55 Martian craters 55 habitable planet 55 journal Meteoritics 55 Meridiani 55 Jonathan Lunine 55 carbonaceous chondrite 55 cosmic phenomena 55 Astrophysicists 55 Kuiper belt objects 55 Mars 55 Enceladus 55 hematite mineral 55 supersymmetric particles 55 planemos 55 sunlike stars 55 Saturn moon 54 Corot 7b 54 exobiology 54 astrophysicists 54 Astrobiology 54 Lake Vostok 54 planet Gliese #g 54 climate modellers 54 extraterrestial 54 journal Icarus 54 exo planets 54 lunar craters 54 high temperature superconductivity 54 distant supernovae 54 comets asteroids 54 biosignature 54 ALH# 54 comet nuclei 54 extraterrestrial 54 choanoflagellates 54 Martian 54 Snowball Earth 54 jarosite 54 exoplanet atmospheres 54 planets 54 Astrobiology Magazine 54 smoothest flattest 54 Saturn moon Enceladus 54 hydrothermal vent 53 Grillmair 53 Anthony Remijan 53 noctilucent clouds 53 moons orbiting 53 atmospheric oceanic 53 cosmological observations 53 Cassini Huygens 53 planets astronomers 53 meteor impacts 53 martian meteorites 53 Mojzsis 53 astrophysical 53 Titan Saturn 53 superheavy elements 53 Kepler Mission 53 interstellar grains 53 Gliese #c 53 SETI Search 53 Di Achille 53 exosphere 53 NASA Kepler spacecraft 53 protoplanetary disks 53 microbialites 53 lunar meteorites 53 exo planet 53 missing baryons 53 astronomical objects 53 Jakosky 53 moon Enceladus 53 superfluids 53 extremophile 53 evolutionary biologists 52 paleoclimatology 52 planetary geologist 52 Schulze Makuch 52 perchlorate salts 52 methanogens 52 planetary atmospheres 52 KBOs 52 biophysicists 52 BP Psc 52 habitable zones 52 clathrates 52 cryovolcanism 52 Saturnian moon Titan 52 Mars CRISM 52 homochirality 52 asteroids comets 52 planetary scientist 52 astronomers 52 Michael Studinger 52 carbonate globules 52 super Earths 52 dirty snowballs 52 pre biotic 52 Jupiter moon Io 52 NASA Astrobiology Institute 52 comet McNaught 52 Pluto Charon 52 Manned missions 52 meteorites 52 Super Earths 52 hydrosphere 52 telescopic observations 52 Hubble observations 52 COROT 7b 52 planets comets 52 magma ocean 52 inhabitable planets 52 UFO phenomena 52 NASA Kepler 52 Higgs particle 52 comets 52 paleontologists 52 Astrophysical 52 sulfate salts 52 Chandra Wickramasinghe 52 Sasselov 51 Compact Reconnaissance Imaging Spectrometer 51 Cosmologists 51 Gliese #d 51 Climate Experiment GRACE 51 Martian meteorite 51 abiogenesis 51 stromatolites 51 galaxy formation 51 spherules 51 polar craters 51 cometary dust 51 comets meteors 51 planetary nebulae 51 Drake Equation 51 extraterrestrial civilizations 51 planets orbiting stars 51 Gliese #g 51 organic compounds 51 cometary 51 interstellar clouds 51 Sara Seager 51 Gamma ray burst 51 Venusian atmosphere 51 Svedhem 51 microbes 51 geomicrobiology 51 sub glacial lakes 51 carbonaceous meteorites 51 GJ #b [001] 51 smoothest flattest spot 51 interstellar dust grains 51 astrophysical objects 51 Felisa Wolfe Simon 51 Wide Angle Search 51 Woese 51 cryptozoologists 51 carbonate minerals 51 APXS 51 Nikku Madhusudhan 51 Meteoritics 51 GFAJ 1 51 cosmological theories 51 Saturn rings 51 Fermi Paradox 51 hydrothermal vents 51 planetary Transits 51 Earth biosphere 51 paleobiology 51 Martian arctic 50 extrasolar planet 50 Galilean moons 50 OGLE TR #b 50 unmanned probes 50 microscopic fossils 50 potentially habitable planets 50 Hakan Svedhem 50 Exoplanets 50 Miller Urey experiment 50 NASA Cassini 50 gray hematite 50 lunar crust 50 photosynthetic microbes 50 Europa Ganymede 50 Microbiologist Cynan Ellis 50 tektites 50 lunar soil 50 galactic cosmic rays 50 physicists 50 carbonaceous chondrites 50 theoretical physicists 50 shadowy craters 50 paleobiologists 50 planetary geology 50 Planetary scientists 50 NASA rovers 50 Higgs Boson particle 50 asteroid impacts 50 Otto Bliesner 50 alien civilizations 50 unconventional superconductivity 50 nucleosynthesis 50 particle physicists 50 Cosmic Microwave Background 50 Wilkinson Microwave Anisotropy Probe 50 mantle plumes 50 Carl Pilcher 50 prebiotic soup 50 carbonyl sulfide 50 mineral olivine 50 nanobacteria 50 planets circling stars 50 Earthly contamination 50 Oceanographers 50 undersea volcanoes 50 planetary science 50 interstellar cloud 50 noble gases 50 matter antimatter asymmetry 50 geochemist 50 protoplanet 50 circumstellar disks 50 Higgs bosons 50 gravitational microlensing 50 single celled microorganisms 50 martian rocks 50 planetary astronomer 50 neutrino particles 50 Vakoch 50 masers 50 extrasolar worlds 50 neutralinos 50 Dimitar Sasselov 50 magnetic monopoles 50 Project Ozma 50 solar corona 50 Oort cloud 50 primitive organisms 50 Nima Arkani Hamed 49 Korotev 49 dimming starlight 49 supervolcanoes 49 spectroscopic observations 49 Kuiper belt 49 Jeffrey Kargel 49 methane hydrates 49 CoRoT 9b 49 Jean Luc Margot 49 microfossils 49 melt inclusions 49 observable phenomena 49 archaea 49 subglacial 49 Jupiter moons Europa 49 Mössbauer 49 Orbiter LRO 49 planetary surfaces 49 AERONET 49 martian 49 tardigrades 49 Upsilon Andromedae b 49 Dauphas 49 terraforming Mars 49 Goldilocks planet 49 spectral fingerprints 49 Bose Einstein condensates 49 planetary alignments 49 Cometary 49 frigid arctic plains 49 Mini TES 49 methane seeps 49 earthlike planets 49 silicates 49 interstellar molecules 49 exoplanets 49 particle astrophysics 49 Fermi paradox 49 chondrites 49 Planetary Science Institute 49 MARSIS radar 49 Extrasolar 49 nebular 49 Richard Mushotzky 49 Evolution Explorer 49 Terrestrial Planet Finder 49 Saturn Cassini 49 mineralogical composition 49 neurobiologists 49 Avi Loeb 49 Larry Soderblom 49 axions 49 Neanderthal teeth 49 sterile neutrinos 49 neutrino oscillation 49 JIMO 49 subglacial lakes 49 nucleobases 49 distant quasars 49 Galileo spacecraft 49 Fred Hoyle 49 exoplanets orbiting 49 Gliese #G 49 Red Rectangle 49 outer planets 49 Cassini flyby 49 lunar magma 49 olivine mineral 49 IRC +# 49 exoplanetary systems 49 Martian rovers 49 cosmological models 49 solar nebula 49 X ray spectrometer 49 intelligent beings 49 P/# A2 49 coronal heating 49 radioactive nuclei 49 exoplanet 49 Palaeocene Eocene Thermal Maximum 49 Kuiper Belt 49 Cabeus 49 binary asteroid 49 binary asteroids 48 Seth Shostak 48 chiral metamaterials 48 hydroxyl molecules 48 neutrino oscillations 48 Jean Pierre Bibring 48 asteroidal 48 Martian microbes exist 48 comet dust 48 radiometric dating 48 Martian soil 48 polygon patterns 48 paleobotany 48 NASA Interstellar Boundary 48 meteorite fragments 48 basaltic rocks 48 Tegmark 48 planets orbiting 48 Oort Cloud 48 colonize Mars 48 quantum physicists 48 Viking landers 48 Martian arctic plains 48 gravitational lenses 48 earthlike 48 Deep Impact eXtended Investigation 48 Red Planet 48 Boethin 48 NASA Lunar Prospector 48 polar regions 48 Mercury magnetosphere 48 chemically reactive salt 48 planetary astronomy 48 unravel mysteries 48 supercomputer simulations 48 Martian surface 48 infrared observatory 48 orbiting spacecraft 48 NASA Wilkinson Microwave 48 Astrobiology Institute 48 CoRoT satellite 48 planets asteroids 48 Anisotropy Probe WMAP 48 COROT 48 photochemistry 48 ufologists 48 stony meteorites 48 archaeo 48 Jill Tarter 48 cosmological 48 Io Europa 48 Cassini interdisciplinary 48 moon Charon 48 SPICAM 48 Bonnie Buratti 48 palaeontologists 48 Charles Beichman 48 Omega Centauri 48 paleoclimate 48 innermost planet 48 HD #b [002] 48 Saturn moons Enceladus 48 Foing 48 theoretical particle 48 cometary material 48 lava tubes 48 Kuiper Belt Object 48 oxygen isotopes 48 NASA Kepler telescope 48 extragalactic 48 organisms 48 Fermi telescope 48 Andrea Ghez 48 perchlorates 48 meteorite hunters 48 Dirk Schulze Makuch 48 Krimigis 48 Exoplanet 48 microphysical 48 planet Gliese #c 48 meteorite impacts 48 Dry Valleys 48 fluid inclusions 48 SN#A 48 gaseous planets 48 fossils 48 Drake Deming 48 astrophysical phenomena 48 Convection Rotation 48 OSIRIS REx 48 Astrophysics Cambridge Mass. 48 astronomical phenomena 48 Lapen 48 NASA twin rovers 48 faint galaxies 48 comets orbiting 48 primordial ingredients 48 concretions 48 chemical reactivity 48 abiogenic 48 microplastics 48 Priscu 48 Sushil Atreya 48 spectroscopically 48 God Particle 48 NASA Cosmic Background 48 Neutron Spectrometer 48 atmospheric chemistry 48 superstring theory 48 mineralogist 48 topological insulators 48 evaporite deposits 48 evolutionary theorists 48 geochronology 48 ESA Integral 48 called gray hematite 47 interstellar dust particles 47 Nili Fossae 47 Fermi Telescope 47 isotopic ratios 47 moon Titan 47 supersymmetry 47 Lake Untersee 47 NASA Cassini spacecraft 47 merging galaxies 47 shadowed craters 47 alien lifeforms 47 Nectocaris 47 Ziurys 47 atmospheric aerosols 47 Bedout 47 Storrie Lombardi 47 permanently shadowed regions 47 Hot Jupiters 47 Avishay Gal Yam 47 comet Wild 47 extraterrestrial beings 47 Rosetta lander 47 paleoecologist 47 Orbiter MRO 47 EPOCh 47 Jupiter moons 47 weakly interacting 47 planetary orbits 47 planets orbiting sun 47 WASP #b 47 phlogiston 47 Epsilon Eridani 47 unicellular organisms 47 icy moon Enceladus 47 infrared telescopes 47 BLG #Lb 47 Cosmology 47 Prof Pillinger 47 Cancri e 47 climate modelers 47 methane hydrate 47 BP Piscium 47 boson 47 Nobel laureate physicist 47 paleobiologist 47 geology paleontology 47 dwarf galaxies 47 Herschel Space Telescope 47 WMAP satellite 47 Zalasiewicz 47 chondritic 47 Martin Tomasko 47 microcompartments 47 electron neutrinos 47 Alfven waves 47 Sigurd Hofmann 47 volcanic vents 47 retrograde orbits 47 reionization 47 geobiology 47 Planetary scientist 47 planets circling 47 coccolithophores 47 Martian terrain 47 extraterrestrial civilization 47 coronal loops 47 trilobites 47 Rossby waves 47 WIMPs 47 mud volcanoes 47 smoggy atmosphere 47 Jovian moons 47 SNfactory 47 distant galaxy clusters 47 Infrared Array Camera 47 abiotic 47 CRISM 47 Phoebe orbits 47 gamma ray observatory 47 occultations 47 filamentary structure 47 Cassini magnetometer instrument 47 Kazantzidis 47 Saturn magnetosphere 47 biologists 47 biogenic 47 dinosaur extinction 47 IntergalaticEarth 47 Cassini flybys 47 LCROSS mission 47 sedimentary deposits 47 primordial soup 47 extrasolar planets orbiting 47 komatiites 47 distant supernovas 47 Pascale Ehrenfreund 47 comet 47 transiting exoplanets 47 GRBs 47 extra terrestrials 47 ostracods 47 THEMIS 47 glaciologists 47 Dan Werthimer 47 Viking orbiters 47 planetary 47 biogeochemist 47 Planetary Transits 47 discoverers 47 rocky extrasolar planet 47 sea hydrothermal vents 47 single celled organisms 47 gravitational wave 47 quantum chromodynamics 47 globular clusters 47 geoneutrinos 47 Quaoar 47 renowned astrophysics observatory 47 Nasa Kepler 47 NASA astrobiologist 47 HUDF 47 sulfate minerals 47 cosmic collisions 47 superfluidity 47 Spudis 47 element osmium 47 Puijila 47 yardangs 47 Thiemens 47 Solar TErrestrial RElations Observatory 47 Jeffrey Plaut 47 Aberdeen Oceanlab 47 HiRISE camera aboard 47 Extraterrestrial Intelligence Institute 47 planet HD #b 47 quark gluon plasma 47 extraterrestrials 47 Hörst 47 colliders 47 eukaryote 47 ammonia hydrates 47 WMAP 47 verified experimentally 47 buckyballs 47 Archaea 47 photosynthetic organisms 47 Friis Christensen 47 Dalcanton 47 University Lamont Doherty 47 Christopher Chyba 47 heavily cratered 47 Gusev crater 47 Maunder minimum 47 stellar seismology 47 stellar nurseries 47 moons circling 47 NASA satellites orbiting 47 Kuiper Belt objects 47 polar caps 47 Hap McSween 47 molecular biologists 47 sulfate aerosols 47 astronomical observations 47 mammal fossils 47 moons Phobos 46 Corot 9b 46 Earth asteroids 46 lunar orbiters 46 chondrules 46 gas hydrates 46 aerosol particles 46 look distractingly cartoony 46 telescopes astronomers 46 Uranus Neptune 46 NASA Astrobiology 46 microbial 46 coelacanths 46 NASA Opportunity rover 46 equatorial regions 46 neutron spectrometer 46 forams 46 celled organisms 46 Aram Chaos 46 Observatory STEREO 46 sunlike star 46 Zarnecki 46 Franck Marchis 46 astrometry 46 Saturnian moon 46 superstrings 46 feathered dinosaurs 46 ESA Mars 46 thermophiles 46 geophysicists 46 Meteorites 46 extraterrestrial microbes 46 palaeontology 46 aerosol measurements 46 GJ #b [002] 46 Poinar 46 XMM Newton 46 Panspermia 46 interstellar medium 46 phyllosilicate 46 underlying molecular mechanisms 46 nanomechanics 46 microbiologists 46 Planetary Science Letters 46 Carl Sagan 46 orbited Jupiter 46 tetrapods evolved 46 BBSRC funded 46 Planetary Science 46 Space Physics 46 interstellar dust 46 exoplanet orbiting 46 Chicxulub impact 46 theoretical astrophysics 46 visit http:/saturn.jpl.nasa.gov 46 MINOS 46 molecular underpinnings 46 graphite whiskers 46 speleothems 46 Cassini scientist 46 smallest exoplanets 46 single celled 46 Solar System 46 Planck satellite 46 microlensing events 46 enterotypes 46 Martian landscape 46 lifeforms 46 Visit SPACE.com 46 multicellularity 46 Endurance crater 46 Neptune Uranus 46 Martian gullies 46 geologists 46 gravitational waves 46 Erwin Schrödinger 46 Mario Livio 46 quark gluon 46 Bojowald 46 Son Nghiem 46 Meridiani Planum 46 giant gaseous planets 46 psychic phenomena 46 Paleoclimate 46 UA Lunar 46 Gravitational waves 46 methanogenic 46 marine ecologists 46 quasicrystals 46 Jonathan Lunine Cassini 46 HD#b 46 Joel Primack 46 ultracold atoms 46 planetary sciences 46 Extraterrestrial Intelligence 46 Ulysses spacecraft 46 Martian rover 46 theropod dinosaurs 46 igneous rocks 46 mesosphere 46 molecule buckminsterfullerene 46 Kuchner 46 Emily Lakdawalla 46 Viking Lander 46 Astrophysicist 46 Garth Illingworth 46 reionization epoch 46 diatoms 46 Laser Interferometer Space 46 Meteorite Men 46 Descent Imager Spectral Radiometer 46 zeolites 46 gaseous planet 46 Astrophysical Journal 46 Geomyces destructans 46 Robin Canup 46 CERN experiments 46 Murchison meteorite 46 Stephen Mojzsis 46 Svensmark 46 Richard Feynman 46 lobate scarps 46 morphological evolution 46 Forensic entomology 46 journal Geophysical Research 46 slime molds 46 synthetic genomics 46 Earths orbiting 46 HiRISE images 46 CoRoT 7b 46 journal Geology 46 KIPAC 46 nitrogen fixation 46 spectral signatures 46 nanotechnologists 46 Henry Bortman 46 brown dwarfs 46 neutrino 46 left handed isovaline 46 Evolutionary biologists 46 Fomalhaut b 46 CAIs 46 evolutionary origins 46 embodied cognition 46 Rychard Bouwens 46 LOFAR 46 Hyakutake 46 layered outcrops 46 theoretical calculations 46 landforms 46 presolar grains 46 silicate minerals 46 supernova explosions 46 liquid ethane 46 paleoclimatologists 46 worthwhile Schwehm 46 Maria Zuber 46 dinosaur species 46 anthropic 46 X ray wavelengths 46 Galaxy Evolution 46 Lewis Dartnell 46 axion 46 ExoMars 46 zircons 46 Cyanobacteria 46 oceanographers 46 imaging spectrometer 46 southern supercontinent 46 KT boundary 46 Higgs Boson 46 alien beings 46 Gaia Hypothesis 46 JILA 46 explorers 46 electrons behave 46 Spaceguard 46 outermost planets 46 Sromovsky 46 Caltech astronomer 46 roseum 46 testable predictions 46 Smithsonian astronomer 46 CIRES 46 Hesperian Epoch 46 interactome 46 planet Uranus 46 particle colliders 46 Giovanni Cassini 46 lunar poles 46 multicellular animals 46 Ice Age mammals 46 McMurdo Dry Valleys 46 hydrogen helium 46 Epoxi 46 Extra Terrestrial Intelligence 46 Upsilon Andromedae 46 Heliophysics 45 superatoms 45 Anisotropy Probe 45 antineutrinos 45 exoplanets planets outside 45 Shewanella 45 Abdalati 45 palaeo 45 CSICOP 45 primitive meteorites 45 distant galaxies 45 prokaryotes 45 Galactic cosmic rays 45 Syrtis Major 45 Candor Chasma 45 Sipiera 45 planetoids 45 Noachian era 45 paleontology 45 Nasa spacecraft 45 NASAs 45 GJ#b 45 CU Boulder ecology 45 aurorae 45 mineral hematite 45 Opportunity rover 45 Valles Marineris 45 atom smashers 45 McDonald Aeberli Funeral Home 45 evolutionary psychologists 45 medieval archeology 45 heliosphere 45 VIRTIS 45 isotope fractionation 45 dusty disks 45 Himalayan river basins 45 Scripps Oceanography 45 Relations Observatory STEREO 45 circumstellar 45 lepidopterists 45 Diviner 45 tiny single celled 45 Lake Cheko 45 Fashion Movie Reviews 45 highly elliptical orbits 45 planets moons 45 lunar missions 45 Observatoire de Paris 45 quantum criticality 45 anthropic principle 45 cosmological distances 45 high temperature superconductors 45 Kepler spacecraft 45 type Ia supernovae 45 lunar explorers 45 Michael Flasar 45 Voorwerp 45 Planetary Protection 45 exosolar planets 45 orbiting Saturn 45 chondritic meteorites 45 HiRISE image 45 Ontario Lacus 45 Mercury flyby 45 Evolutionary biology 45 Rosetta stone 45 dustier stormier atmosphere 45 Squyres Cornell 45 comet particles 45 Spacewatch 45 crewed spacecraft 45 Genographic Project 45 Greg Delory 45 MARSIS 45 OMEGA instrument 45 glacial geology 45 Cosmic Evolution 45 planetary magnetospheres 45 MiniBooNE 45 Jenniskens 45 microscopic organisms 45 human microbiome 45 Rainer Klement 45 Kepler Space Telescope 45 MAVEN 45 Pääbo 45 Herod tomb 45 UA Steward Observatory 45 meteoroid impacts 45 NEAs 45 interstellar particles 45 assumed planets circling 45 polarimetry 45 cryosphere 45 planetary missions 45 botanists 45 paleoanthropologists 45 Kuiper belt object 45 ESA ASI 45 cosmic rays 45 RHESSI 45 Microraptor gui 45 fainter objects 45 osmium 45 Astrophysics MOA 45 protoplanetary disk 45 Mount Bosavi 45 Baross 45 detect gravitational waves 45 CMB radiation 45 extrasolar planetary 45 Spitzer Space Telescope 45 Huygens mission 45 patterning technique 45 gut microbes 45 Terrestrial Magnetism 45 magmas 45 crystalline silicates 45 retrograde orbit 45 Atmospheric Oceanic 45 Perseus Cluster 45 photosphere 45 Interstellar Boundary Explorer 45 braneworld 45 plate tectonics 45 Alfred Wegener 45 told physicsworld.com 45 Extraterrestrial Life 45 biomineralization 45 volcano Olympus Mons 45 particle acceleration 45 asteroid 45 Gerta Keller 45 Percival Lowell 45 Michael Zolensky 45 Martian crater 45 olivine 45 Mars northern latitudes 45 Terrestrial Planet Finder TPF 45 Great Observatories 45 magnetosphere 45 isotopic signatures 45 William Borucki 45 hot Jupiters