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(Click for frequent words.) 79 astrophysicist 72 planetary scientist 72 Astronomer 72 astronomers 67 physicist 66 cosmologist 66 theoretical physicist 65 amateur astronomer 65 Astrophysicist 64 astronomy 64 planetary astronomer 64 astrophysicists 62 scientist 61 particle physicist 60 CfA 60 Observatory astronomer 59 planetary geologist 59 Astronomy 59 observatory 59 theoretical astrophysicist 59 Astrophysics 58 atmospheric scientist 58 Astrophysicists 58 Sara Seager 58 astrobiologist 58 Planetary Science Institute 58 Smithsonian astronomer 58 stargazer 58 Caltech astronomer 58 telescope 57 Hubble astronomer 57 geoscientist 57 Astronomers 57 Cassini imaging 57 Carnegie Observatories 57 Jay Melosh 57 atmospheric chemist 57 Steward Observatory 56 physicists 56 geochemist 56 climate modeler 56 astrophysics 56 Lick Observatory 56 planetary astronomy 56 archaeologist 56 geophysicist 55 Alex Filippenko 55 mathematician 55 atmospheric physicist 55 telescopes 55 evolutionary biologist 55 Lowell Observatory 55 exoplanet hunter 55 biophysicist 55 astronomer Johannes Kepler 55 Wolszczan 55 microlensing 55 exoplanetary 55 Physicist 55 skywatcher 55 Robert Jedicke 55 Astrophysical Institute 55 Planetary scientist 55 Rychard Bouwens 54 astrophotographer 54 MIT planetary scientist 54 oceanographer 54 Shri Kulkarni 54 extrasolar planets 54 Avishay Gal Yam 54 Andrea Ghez 54 Corot 7b 54 palaeontologist 54 STScI 54 astrophysical 54 Giovanni Cassini 53 Observatory 53 seismologist 53 paleoanthropologist 53 paleontologist 53 geologist 53 Fritz Zwicky 53 infrared telescope 53 Nikku Madhusudhan 53 exoplanet 53 Gehrels 53 geographer 53 KIPAC 53 Epsilon Aurigae 53 Palomar Observatory 53 Erik Asphaug 53 Storrie Lombardi 53 Pieter van Dokkum 53 Gerard Kuiper 52 infrared observatory 52 quasars 52 glaciologist 52 Astronomical Observatory 52 MMT Observatory 52 extrasolar 52 Geoffrey Marcy 52 Carnegie Institution 52 Kuiper belt objects 52 Richard Mushotzky 52 Smithsonian Astrophysical Observatory 52 Telescope 52 Glaciologist 52 geobiologist 52 ufologist 52 Keck Observatory 52 Sasselov 52 Cassini scientist 52 Planetary Laboratory 52 paleoclimatologist 52 Richard Binzel 52 Greg Delory 52 Jenniskens 52 amateur astronomers 52 Grillmair 52 Space Physics 52 de Pater 51 NASA Jet Propulsion Laboratory 51 X ray observatory 51 NASA Far Ultraviolet 51 MIT Haystack Observatory 51 paleobiologist 51 Adam Riess 51 Renu Malhotra 51 Sromovsky 51 Gravitational lensing 51 Filippenko 51 Galaxy Evolution 51 observatories 51 climatologist 51 Kuchner 51 neurobiologist 51 Ray Jayawardhana 51 Armagh Observatory 51 optical telescopes 51 evolutionary geneticist 51 Observatoire de Paris 51 SNfactory 51 UA Steward Observatory 51 orbiting Chandra 51 extrasolar planetary systems 51 extrasolar planet 51 cosmologists 51 Harvard Smithsonian 51 Egyptologist 51 Earthlike planets 51 NOAO 51 Astronomical Society 50 XMM Newton 50 anthropologist 50 Cancri e 50 Rogier Windhorst 50 HD#b 50 gaseous planet 50 Evolution Explorer 50 Stan Woosley 50 NASA astrobiologist 50 astronomical observations 50 Voorwerp 50 earthshine 50 NASA Fermi Gamma 50 Cosmologist 50 NASA Goddard 50 exo planet 50 archeologist 50 planets 50 researcher 50 ESO VLT 50 Keck telescope 50 GJ #b [002] 50 aurora 50 Tycho Brahe 50 Jedicke 50 cosmic ray 50 Mount Stromlo Observatory 50 Spacewatch 50 comet 50 Tommaso Treu 50 ornithologist 50 Hipparchus 50 astronomer Edmond Halley 50 Royal Astronomical Society 50 Space Telescope Science 49 NASA astrobiology 49 Planetary Institute 49 X ray telescopes 49 astro physicist 49 COROT 49 Chris Lintott 49 Observatories 49 ESA Herschel 49 Optical Gravitational Lensing Experiment 49 habitable planets 49 Nasa Jet Propulsion 49 Guhathakurta 49 biologist 49 NRAO 49 USGS geologist 49 Astrophysical Journal Letters 49 Deep Impact Principal Investigator 49 Saturn rings 49 volcanologist 49 UA Lunar 49 Gliese #g 49 Owen Gingerich 49 supernova 49 Carey Lisse 49 Kuiper Belt Objects 49 protoplanet 49 zoologist 49 gravitational lensing 49 infrared astronomy 49 Avi Loeb 49 Dimitar Sasselov 49 Astrophysics Cambridge Mass. 49 comets 49 exo planets 49 Astrobiologist 49 NASA Jet Propulsion Lab 49 German astronomer Johannes 49 eclipsing binary 49 Chandra Wickramasinghe 49 astronomer mathematician 49 telescopic observations 49 Earthlike 49 Astronomical 49 gamma ray observatory 49 Franck Marchis 49 planetary Transits 49 Saul Perlmutter 49 magnetar 49 Pasachoff 49 atmospheric sciences 49 Mario Livio 49 cosmology 49 Lunine 49 star gazer 49 Christophe Lovis 49 neuroscientist 49 theoretical physicist Stephen Hawking 49 botanist 49 National Optical Astronomy 49 Astrophysical Journal 49 journal Icarus 49 astrometry 49 Fomalhaut b 49 biochemist 49 Wilkinson Microwave Anisotropy Probe 49 Henrik Svensmark 49 Kepler Mission 49 Clyde Tombaugh 49 astronomical observatory 49 pulsars 49 Gliese #c 49 astronomer Edwin 49 RHESSI 49 Omega Centauri 49 Seth Shostak 49 High Altitude Observatory 49 RXTE 49 distant galaxies 49 Kepler #b 48 neutrino 48 Percival Lowell 48 Mullard Space Science 48 celestial object 48 palaeoanthropologist 48 quasar 48 occultation 48 Harlow Shapley 48 SN #gy 48 Hanny Voorwerp 48 UKIRT 48 Michael Zolensky 48 Peter Jenniskens 48 Theoretical physicist 48 Subrahmanyan Chandrasekhar 48 Anisotropy Probe 48 Jeffrey Kargel 48 X ray observatories 48 optical telescope 48 Planetary Scientist 48 Theoretical Astrophysics 48 Planetary Sciences seminar 48 supernovae 48 mathematical physicist 48 HD #b [002] 48 Terrestrial Magnetism 48 Coel Hellier 48 Cassini 48 nicknamed Xena 48 Applied Physics Laboratory 48 Nasa Kepler 48 WMAP 48 Berkeley Geochronology Center 48 trans Neptunian objects 48 astrobiology 48 Samuel Oschin Telescope 48 PSR B# +# 48 historian 48 geochemists 48 gravitational wave 48 Jay Pasachoff 48 Bryan Gaensler 48 inch Samuel Oschin 48 Pan STARRS 48 Nima Arkani Hamed 48 GRB #B 48 astronomical objects 48 Maria Zuber 48 entomologist 48 Niels Bohr Institute 48 Solar Observatory 48 zoology professor 48 protoplanetary disks 48 planet orbiting 48 gravitational lenses 48 transiting planets 48 Caltech seismologist 48 WM Keck Observatory 48 crystallographer 48 virologist 48 spacecraft Cassini 48 Lamont Doherty 48 NASA astrophysicist 48 asteroid 48 ESA XMM Newton 48 theoretical physicists 48 Keck Telescope 48 developmental biologist 48 marine geophysicist 48 gravitational microlensing 48 paleobotanist 48 supernova remnant 48 WMAP satellite 48 Makiko Sato 48 atmospheric sciences professor 48 Jonathan Lunine 48 Baross 48 Cosmologists 48 cosmic microwave background 48 globular clusters 48 Nir Shaviv 48 Comet Halley 48 Richard Berendzen 48 Dan Werthimer 48 Archaeologist 48 Planetary Lab 48 Astrophysics MOA 48 Jet Propulsion Laboratory 48 X ray wavelengths 48 Whipple Observatory 48 MicroFUN 48 planetary science 48 MPIfR 48 Neils Bohr 48 Southern Observatory ESO 48 Extraterrestrial Intelligence Institute 47 Carl Friedrich Gauss 47 NASA Wilkinson Microwave 47 CERN physicist 47 biogeochemist 47 SOAR telescope 47 astronomer Percival Lowell 47 auroral emissions 47 Halley comet 47 gamma ray bursts 47 skywatchers 47 Nial Tanvir 47 Asantha Cooray 47 vertebrate paleontologist 47 astronomy buff 47 Werthimer 47 Astronomical Society AAS 47 Jodrell Bank Observatory 47 Galilean satellites 47 Halton Arp 47 Kuiper Belt Object 47 Seismologist 47 Astrophysics Laboratory 47 Anne Verbiscer 47 TrES 4 47 terrestrial planets 47 Grenoble Observatory 47 Giovanna Tinetti 47 galaxies 47 orbiting telescope 47 Gaensler 47 Meteoritics 47 brown dwarfs 47 sociologist 47 Saturn Enceladus 47 cosmological distances 47 A'Hearn 47 Mathematician 47 ecologist 47 Mojzsis 47 distant galaxy 47 George Djorgovski 47 Keck telescopes 47 geneticist 47 Spitzer Space Telescope 47 Composite Infrared Spectrometer 47 GALEX 47 astrobiological 47 SDSS II 47 LOFAR 47 seismologists 47 Henize #-# 47 extragalactic 47 inch refracting telescope 47 Submillimeter Array 47 WASP #b 47 Arecibo Observatory 47 Astronomer Royal 47 Fermi LAT 47 Konacki 47 X ray telescope 47 Sushil Atreya 47 potentially habitable planets 47 physicist Max Planck 47 Nasa Goddard Space 47 Project Ozma 47 orbiting 47 Relations Observatory STEREO 47 planetary geology 47 entomology professor 47 elliptical galaxies 47 gamma ray burst 47 James Fanson 47 Uranian 47 Extra Terrestrial Intelligence 47 Bonanos 47 AU Mic 47 Von Frese 47 molecular biologist 47 meteorite 47 Don Gurnett 47 Geological Survey geophysicist 47 observational astronomy 47 brightest supernova 47 Ted Molczan 47 Radio Astronomy Observatory 47 Oort cloud 47 Earthlike planet 47 principal investigator 47 Mandushev 47 Observatory telescope 47 Dava Sobel 47 Maunder minimum 47 planemos 47 Gemini Observatory 47 Professor Chandra Wickramasinghe 47 Cosmology 47 Image NASA JPL 47 inhabitable planets 47 rocky planets 47 Allan Sandage 47 orbited Jupiter 47 Saturnian moon 47 mineralogist 47 Tegmark 47 Anisotropy Probe WMAP 47 Planetary Science 47 Nobel laureate physicist 47 palaeontologist Dr 47 HiRISE 47 Alicia Soderberg 47 Space Telescope 47 Martin Tomasko 47 BP Psc 46 Wolfgang Ketterle 46 evolutionary anthropologist 46 Comet #P 46 astronomer Clyde Tombaugh 46 Mamajek 46 Bruce Jakosky 46 Astrobiology 46 Astrophysical 46 molecular geneticist 46 Paul Chodas 46 Martin Haehnelt 46 SETI Institute 46 meteoroid 46 Neil Gehrels 46 THEMIS 46 distant supernovae 46 Kuiper Belt object 46 astrophysical phenomena 46 distant quasar 46 GRBs 46 Guy Consolmagno 46 scientists 46 Isabella Velicogna 46 Microlensing Observations 46 theoretical cosmologist 46 Ring Nebula 46 comets orbiting 46 faint galaxies 46 Grote Reber 46 Haystack Observatory 46 Milky Way galaxy 46 Crab Pulsar 46 geomagnetism 46 Wide Angle Search 46 Fran Bagenal 46 Roukes 46 Volker Bromm 46 bioengineer 46 University Lamont Doherty 46 coronal heating 46 redshift 46 retrograde orbit 46 OGLE TR #b 46 Fermi telescope 46 Upsilon Andromedae 46 Foing 46 Adaptive Optics 46 planets orbiting 46 CRISM 46 linguistics professor 46 inch refractor telescope 46 Rainer Klement 46 Siding Spring 46 intrinsic brightness 46 Pluto Charon 46 Carnegie Institution planetary geologist 46 Kawaler 46 moon Ganymede 46 Einstein theories 46 rocky extrasolar planet 46 planets orbiting distant 46 Grammier 46 Extraterrestrial Physics 46 NASAs 46 planetary sciences 46 Krimigis 46 Comet Holmes 46 Paleoanthropologist 46 supermoon 46 Galilean moons 46 infrared telescopes 46 cosmologist Stephen Hawking 46 CoRoT 9b 46 Joel Primack 46 meteorite hunter 46 Alaska Fairbanks Geophysical 46 ultraviolet spectrograph 46 Ellery Hale 46 Exoplanet 46 Amateur astronomers 46 axion 46 vulcanologist 46 geophysicists 46 Evolutionary biologist 46 Telescope LSST 46 SIRTF 46 La Silla observatory 46 Plait 46 Triangulum Galaxy 46 Physicists 46 Arno Penzias 46 star Fomalhaut 46 Jupiter moon Io 46 Delta Cephei 46 Paranal Chile 46 celestial bodies 46 cognitive neuroscientist 46 Herschel telescope 46 GJ#b 46 ray Space Telescope 46 Lulin 46 radial velocity 46 zodiacal light 46 general relativity 46 supernovas 46 Anthropologist 46 Spaceweather.com 46 Rosaly Lopes 46 dwarf planets 46 ESA Integral 46 comet McNaught 46 Roland Burgmann 46 computational biologist 46 Geza Gyuk 46 meteor shower 46 planet Uranus 46 stellar occultations 46 Le Verrier 46 ionospheric 46 NASA Chandra 46 Johannes Kepler 46 Paleontologist 46 moons circling 46 CU Boulder Laboratory 46 Hubble Space Telescope 46 meteor 46 paleoecologist 46 distant quasars 46 relativity theory 46 Xavier Bonfils 46 High Angular Resolution 46 moons orbiting Saturn 46 reionization 46 Higgs bosons 46 Dauphas 46 IceCube 46 HD #b [001] 46 galactic cosmic rays 46 neutron stars 46 Observatory SDO 46 theoretical astrophysics 46 transiting exoplanet 46 Harald Ebeling 46 Drake Deming 46 Nousek 46 amateur skywatchers 46 Marc Kuchner 46 Max Planck Institut fuer 46 avid amateur astronomer 46 Cosmological Physics 46 Drake Equation 45 X ray Observatory 45 quantum gravity 45 Alex Wolszczan 45 LIGO 45 Climatologist 45 Kuiper belt 45 dwarf galaxies 45 Leiden Observatory 45 anthropology professor 45 starburst galaxy 45 Michael Studinger 45 Andromeda galaxy 45 PASADENA Calif. Astronomers 45 radiotelescope 45 seismology 45 renowned astrophysicist 45 Nasa Ames 45 Epsilon Eridani 45 Cosmic Background Explorer 45 detect gravitational waves 45 Orion Nebula 45 auroras 45 Cassini radar 45 meteorite hunters 45 Dave Reneke 45 SPACE.com 45 Vikhlinin 45 Planetology 45 Herzberg Institute 45 Solar System 45 Dalcanton 45 Cassini ion 45 planets comets 45 cartographer 45 GJ #b [001] 45 cosmic cannibal 45 HD# [002] 45 Uranus Neptune 45 Hubble telescope 45 theologian 45 Planck satellite 45 Comet Lulin 45 OGLE 45 orbiting Hubble Space Telescope 45 postdoctoral researcher 45 Jesuit astronomer 45 DEEP2 45 Very Large Array 45 Gemini Telescope 45 Planetary Transits 45 Laser Interferometer Gravitational Wave 45 infrared mapping spectrometer 45 Kaltenegger 45 Kazantzidis 45 comet Hale Bopp 45 Caltech physicist 45 Enrico Fermi Institute 45 KBOs 45 particle physicists 45 Maciej Konacki 45 discoverer 45 Cassini flyby 45 Vassilis Angelopoulos 45 Verbiscer 45 Gliese #d 45 NASA Astrobiology Institute 45 postdoctoral fellow 45 Pierre Simon Laplace 45 Herschel 45 Higgs particle 45 Radioastronomy 45 Crab Nebula 45 UDFy # 45 Institut d' Astrophysique de 45 Martian meteorites 45 X ray binary 45 infrared spectrograph 45 celestial 45 Schawinski 45 ESO Very Large Telescope 45 interstellar cloud 45 Solar Dynamics Observatory 45 Descent Imager Spectral Radiometer 45 astrologer Bejan Daruwalla 45 gamma ray telescope 45 Spaceguard 45 Kip Thorne 45 climate modeller 45 ESO astronomer 45 planet HD #b 45 geomorphologist 45 De Pontieu 45 Volcanologist 45 mu Arae 45 Microlensing Follow Up 45 boson 45 Comet Machholz 45 maser 45 nanoscientist 45 mycologist 45 exoplanets 45 Hubble observations 45 exoplanet orbiting 45 interstellar dust 45 Zolensky 45 Imke de 45 Rolf Kudritzki 45 Saturn moons 45 Explorer WISE 45 planetoid 45 Natalie Batalha 45 stargazers 45 Geological Survey geologist 45 elliptical galaxy 45 astrobiologists 45 botany professor 45 Lawrence Krauss 45 Peter Capak 45 Kuiper belt object 45 Planetary Physics 45 Copernicus Galileo 45 NASA Goddard Space 45 Fred Hoyle 45 cosmic dust 45 celestial objects 45 galaxy cluster 45 Dominion Astrophysical Observatory 45 Jonathan T. Overpeck 45 Saturn aurora 45 Beichman 45 moon Charon 45 Amateur astronomer 45 Shaposhnikov 45 moons orbiting 45 millisecond pulsar 45 StarDate 45 Cosmic Microwave Background 45 Aristarchus 45 astronaut 45 protoplanetary 45 ROSAT 45 Astronomy Observatory 45 pulsar 45 Vakoch 45 RRATs 45 infrared wavelengths 45 Observatory LDEO 45 WIYN 45 optical interferometry 45 CIRES 45 icy moons 45 Max Planck Institute 45 Giovanni Schiaparelli 45 Helix Nebula 45 Geophysicist 45 supergiant star 45 Edmund Halley 45 SETI Search 45 Andromeda Galaxy 45 HUDF 45 Cenko 45 evolutionary ecologist 45 Thomas Harriot 45 Christiaan Huygens 44 planetary 44 #gy 44 type Ia supernova 44 asteroids 44 gravitational waves 44 CoRoT satellite 44 microlensing events 44 imaging spectrometer 44 meteorites 44 Phil Plait 44 dwarf planet 44 Scripps Oceanography 44 USGS seismologist 44 astronomical telescope 44 anatomist 44 scholar 44 Climate Experiment GRACE 44 Gehrz 44 Paquay 44 Bottke 44 Christopher Chyba 44 spectrograph 44 microbiologist 44 extraterrestrial civilizations 44 Particle Astrophysics 44 Gemini telescopes 44 solar corona 44 Telescope BAT 44 Cassini spacecraft 44 Bohdan Paczynski 44 HARPS instrument 44 supersymmetric particles 44 SN #A 44 Geoff Marcy 44 Cassini magnetometer 44 Brera Observatory 44 Gamma ray burst 44 Eta Carinae 44 Hyakutake 44 Sedna 44 Einstein theory 44 Quadrantids 44 Atmospheric Oceanic 44 constellation Carina 44 Gravitational waves 44 BLG #Lb 44 asteroids orbiting 44 active galactic nuclei 44 moon Io 44 Veizer 44 coronal loops 44 galaxy formation 44 Nilton Renno 44 photosphere 44 Spectroscopic Explorer 44 UVOT 44 refracting telescope 44 skywatching 44 roboticist 44 NASA Jet Propulsion 44 celestial mechanics 44 Comet Hale Bopp 44 interplanetary spacecraft 44 emeritus professor 44 palaeontologists 44 nightglow 44 planets Uranus 44 Planetary Studies 44 Jim Kasting 44 celestial phenomena 44 Frank Bertoldi 44 Cassini Ion 44 herpetologist 44 biological oceanographer 44 told physicsworld.com 44 Patricia Tombaugh 44 supergiant stars 44 cosmic microwave radiation 44 Observatory LIGO 44 Adrian Melott 44 marine geologist 44 Neil DeGrasse Tyson 44 Galileo spacecraft 44 National Astronomical Observatory 44 particle astrophysics 44 George Gamow 44 Rashid Sunyaev 44 geomagnetic 44 journal Geophysical Research 44 Stassun 44 Instituto de Astrofisica de 44 noctilucent clouds 44 moons 44 atop Mauna Kea 44 Jack Lissauer 44 Machholz 44 masers 44 cosmic rays 44 Anthony Remijan 44 Kailash Sahu 44 Brother Guy Consolmagno 44 theorist 44 Harold Urey 44 Duari 44 astrologer 44 Magueijo 44 fainter objects 44 Pluto Eris 44 Mary Voytek 44 renowned cosmologist 44 lunar crater 44 paleobiology 44 Karoff 44 supernova explosion 44 Jean Luc Margot 44 Thiemens 44 spectrographs 44 Luann Becker 44 COROT 7b 44 meteors 44 Stephane Udry 44 Cassini Huygens spacecraft 44 Cassini Huygens 44 Oort Cloud 44 Lars Hernquist 44 asteroid collisions 44 professor 44 barred spiral galaxy 44 AB Aurigae 44 Observatory NOAO 44 Geminids 44 Cassini ultraviolet 44 paleontologists 44 geosciences professor 44 Large Telescope Salt 44 Natalia Rybczynski 44 Theoretical Physicist 44 economist 44 phyllosilicates 44 Chicxulub 44 habitable worlds 44 XTE J# 44 Carl Wieman 44 planetary nebulas 44 comet nucleus 44 Jennifer Heldmann 44 Geminga 44 Winglee 44 Nasa spacecraft 44 geological sciences 44 Quaoar 44 magnetars 44 galaxy clusters 44 Ketterle 44 cometary 44 Cepheids 44 Gondolo 44 boffin 44 Fermi Gamma ray 44 retrograde orbits 44 sterile neutrino 44 ESO telescope 44 adaptive optics 44 Gerta Keller 44 behavioral ecologist 44 gravitational lens 44 Kounaves 44 Charon Pluto 44 RS Ophiuchi 44 Eric Feigelson 44 Eric Becklin 44 red supergiant 44 wildlife ecologist 43 Dobsonian telescope 43 Erik Hauri 43 substorms 43 Yusef Zadeh 43 Lovis 43 planetarium 43 astronomer Ptolemy 43 Jay Melosh planetary geologist 43 Upsilon Andromedae b 43 Astronomy buffs 43 Pascale Ehrenfreund 43 SN#A 43 David Spergel 43 galactic mergers 43 Credit NASA JPL 43 Keivan Stassun 43 moon Mab 43 Narlikar 43 Bill Borucki Kepler 43 star gazers 43 MARSIS radar 43 SEGUE 43 Toutatis 43 sunspots 43 Jan Zalasiewicz 43 Bethany Ehlmann 43 Kitt Peak 43 Cassini interdisciplinary 43 Komossa 43 Meenakshi Wadhwa 43 Mauna Kea Hawaii 43 Professor 43 smallest exoplanet 43 heliocentric model 43 Earth asteroids 43 ethologist