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(Click for frequent words.) 72 planetary geologist 72 astronomer 67 Planetary scientist 66 astrobiologist 65 Caltech astronomer 65 planetary astronomer 65 Cassini scientist 65 astrophysicist 64 Planetary Science Institute 63 CfA 63 Jeffrey Kargel 63 Planetary Laboratory 62 principal investigator 62 geochemist 61 Jonathan Lunine 61 Astrophysicist 61 Hubble astronomer 61 planetary astronomy 61 theoretical astrophysicist 61 cosmologist 60 geophysicist 60 planetary science 60 geoscientist 60 UA Lunar 60 NASA astrobiologist 60 geological sciences 60 Carnegie Observatories 59 atmospheric scientist 59 atmospheric physicist 59 planetary sciences 59 KIPAC 59 Sara Seager 59 physicist 59 theoretical physicist 59 MIT planetary scientist 59 atmospheric chemist 59 Bruce Jakosky 59 Martin Tomasko 59 particle physicist 59 Astronomer 58 Erik Asphaug 58 Observatory astronomer 58 Storrie Lombardi 58 William Bottke 58 Jay Melosh 58 Space Physics 58 Isabella Velicogna 58 Richard Mushotzky 58 Meteoritics 58 NASA Jet Propulsion Lab 57 scientist 57 paleobiologist 57 Planetary Lab 57 Smithsonian astronomer 57 biogeochemist 57 climate modeler 57 Rogier Windhorst 57 Steward Observatory 57 Lunine 57 Cassini Ion 57 Astrobiology 57 High Altitude Observatory 56 Rychard Bouwens 56 Carnegie Institution 56 astrobiological 56 Nasa Jet Propulsion 56 Principal Investigator 56 Scripps Oceanography 56 Cassini imaging 56 Astrophysicists 56 Planetary Institute 56 Solar Observatory 56 geobiologist 56 Keck Observatory 56 Christopher Chyba 56 Carey Lisse 56 astrophysics 56 Lowell Observatory 56 de Pater 56 Drake Deming 56 USGS geologist 55 Jet Propulsion Laboratory 55 glaciologist 55 Kuiper belt objects 55 extrasolar planetary systems 55 astrophysicists 55 Kavli Institute 55 Maria Zuber 55 USGS seismologist 55 Shri Kulkarni 55 CIRES 55 NOAO 55 Mojzsis 55 Smithsonian Astrophysical Observatory 55 Robin Canup 55 astrobiology 55 seismologist 55 NASA Jet Propulsion Laboratory 55 STScI 55 Glaciologist 55 Fran Bagenal 55 Terrestrial Magnetism 55 Astrophysics 55 Richard Binzel 55 paleoecologist 55 geomicrobiology 55 Michael Studinger 55 Makiko Sato 54 NASA astrobiology 54 Planetary Physics 54 Spacewatch 54 NASA Goddard 54 Dimitar Sasselov 54 astrophysical 54 Planetary Sciences 54 Cosmology 54 Sasselov 54 Lick Observatory 54 Avi Loeb 54 A'Hearn 54 Atmospheric Oceanic 54 Mars CRISM 54 Andrea Ghez 54 National Optical Astronomy 54 Cassini ion 54 Planetary Scientist 54 climate modeller 54 Grillmair 54 NASA Astrobiology Institute 54 Nasa Goddard Space 54 astronomers 54 Cassini magnetometer 54 oceanographer 54 Planetary Sciences seminar 54 MIT Haystack Observatory 54 Physicist 53 Wolszczan 53 told physicsworld.com 53 Meenakshi Wadhwa 53 theoretical astrophysics 53 Mount Stromlo Observatory 53 biophysicist 53 Berkeley Geochronology Center 53 Image NASA JPL 53 Bottke 53 palaeontologist 53 Roger Bilham 53 Stephen Mojzsis 53 Nikku Madhusudhan 53 Cosmological Physics 53 Lamont Doherty 53 UA Steward Observatory 53 Seismologist 53 evolutionary biologist 53 Franck Marchis 53 Theoretical Astrophysics 53 RHESSI 53 atmospheric sciences 53 Vakoch 53 Baross 53 Atmospheric Sciences 53 Astrophysical 52 NCAR scientist 52 Dirk Schulze Makuch 52 Particle Astrophysics 52 CU Boulder Laboratory 52 Ariel Anbar 52 marine geophysicist 52 Hal Levison 52 paleontologist 52 Jennifer Heldmann 52 Kounaves 52 Thiemens 52 Corot 7b 52 journal Icarus 52 Filippenko 52 planetary geology 52 Giovanna Tinetti 52 galactic cosmic rays 52 Lead researcher 52 Saturn Enceladus 52 Henrik Svensmark 52 computational biologist 52 astrobiologists 52 Jamie Elsila 52 Nasa Ames 52 developmental biologist 52 Caltech seismologist 52 postdoctoral researcher 52 Whipple Observatory 52 Nasser Peyghambarian 52 Adam Riess 52 exoplanet hunter 52 McKay planetary scientist 52 vertebrate paleontologist 52 Vassilis Angelopoulos 52 marine geologist 52 Observatoire de Paris 52 Renu Malhotra 52 Nobel laureate physicist 52 Pieter van Dokkum 52 Astronomy 52 Geophysical Sciences 52 Alberto Saal 52 Cassini interdisciplinary 52 Cryospheric Sciences Branch 52 Douglas Osheroff 52 geomorphologist 52 Jet Propulsion Laboratory JPL 52 HiRISE 52 Gravitational lensing 51 Cassini ultraviolet 51 cognitive neuroscientist 51 Kepler Mission 51 paleoanthropologist 51 Mullard Space Science 51 Daniel Geschwind 51 Geological Survey geophysicist 51 Alfred McEwen 51 Rignot 51 microbial ecologist 51 Astrophysical Journal 51 Kuchner 51 postdoctoral fellow 51 Jonathan Overpeck 51 Planetary Studies 51 Professor 51 SPACE.com 51 Hörst 51 Luann Becker 51 von Frese 51 neurobiologist 51 astrophysical sciences 51 NASA Fermi Gamma 51 Gemini Observatory 51 infrared mapping spectrometer 51 extrasolar 51 climatologist 51 Greg Delory 51 NASAs 51 Asphaug 51 Hakan Svedhem 51 NRAO 51 icy moons 51 planets comets 51 Volcanologist 51 scientist Ray Arvidson 51 Gerard Kuiper 51 John Grotzinger 51 Keck telescope 51 University Lamont Doherty 51 Robert Jedicke 51 Astrophysics Cambridge Mass. 51 Garth Illingworth 51 geochemists 51 NASA Far Ultraviolet 51 paleoclimatologist 51 Dauphas 51 Saul Perlmutter 51 Applied Physics Laboratory 51 astronomy 51 terrestrial planets 51 Jonathan T. Overpeck 51 Bindschadler 51 Heliophysics Division 51 Palomar Observatory 51 British Antarctic Survey 51 postdoctoral scientist 51 biological oceanographer 51 researcher 51 behavioral ecologist 51 Bruce Wielicki 51 adjoint professor 51 Alaska Fairbanks Geophysical 50 Deep Impact Principal Investigator 50 NASA Ames 50 magma ocean 50 nicknamed Xena 50 composite infrared spectrometer 50 Theoretical physicist 50 NASA Heliophysics Division 50 Sromovsky 50 Evolution Explorer 50 Larry Soderblom 50 Joel Primack 50 Cancri e 50 Microscopy Electrochemistry 50 Avishay Gal Yam 50 detect gravitational waves 50 nanoscientist 50 Jenniskens 50 Spudis 50 Oleg Abramov 50 Dikpati 50 Von Frese 50 MMT Observatory 50 Harvard Smithsonian 50 Scripps Institution 50 Astrobiologist 50 Oceanography Centre 50 Abdalati 50 planetary Transits 50 Krimigis 50 van Dokkum 50 Wilkinson Microwave Anisotropy Probe 50 geosciences professor 50 Nima Arkani Hamed 50 Descent Imager Spectral Radiometer 50 SETI Institute 50 mineralogist 50 atmospheric oceanic 50 biological oceanography 50 Cassini radar 50 geologist 50 Michael Zolensky 50 Virtual Planetary Laboratory 50 Kuiper Belt Objects 50 Oort Cloud 50 Konrad Steffen 50 solar corona 50 GJ #b [002] 50 Planetology 50 Astrobiology Institute 50 Crab Pulsar 50 Anisotropy Probe 50 Geological Survey geologist 50 extrasolar planets 50 exoplanetary 50 Eric Becklin 50 Diviner instrument 50 inch Samuel Oschin 50 evolutionary ecologist 50 habitable planets 50 cometary nucleus 50 Carolyn Porco 50 Astronomical Society AAS 50 Mary Voytek 50 geomagnetism 49 Roland Burgmann 49 Berinstain 49 Melosh 49 Jet Propulsion Lab 49 Astrophysical Institute 49 Kaltenegger 49 Planetary Science 49 Natalie Batalha 49 EarthScope 49 Ray Jayawardhana 49 Louise Prockter 49 ecologist 49 postdoctoral scholar 49 Tommaso Treu 49 CRISM 49 Gene Giacomelli 49 NIST physicist 49 Stan Woosley 49 Lawrence Krauss 49 Bruce Banerdt 49 planetary 49 Samuel Oschin Telescope 49 Keck Telescope 49 Coel Hellier 49 MARSIS radar 49 moons orbiting 49 Svedhem 49 Martian dust 49 Pascale Ehrenfreund 49 geosciences 49 JPL 49 Nilton Renno 49 Sushil Atreya 49 Gehrels 49 biologist 49 Charles Beichman 49 Remijan 49 Ellen Stofan 49 neutral mass spectrometer 49 marine ecologist 49 retrograde orbit 49 NSIDC 49 atmospheric chemistry 49 Galaxy Evolution 49 Astrobiology Magazine 49 postdoctoral associate 49 Heliophysics 49 Jeremy Bailenson 49 Matt Sponheimer 49 ESA Herschel 49 Zeebe 49 Chandra Wickramasinghe 49 Dante Lauretta 49 Geophysical Laboratory 49 Herzberg Institute 49 UCO Lick 49 Harold Urey 49 Credit NASA JPL 49 Caltech physicist 49 Geological Survey seismologist 49 SETI Search 49 Dalcanton 49 Jan Zalasiewicz 49 Wettergreen 49 Carl Wieman 49 Schulze Makuch 49 NASA WMAP 49 Active Tectonics 49 Winglee 49 Anthony Remijan 49 Laser Interferometer Gravitational Wave 49 Upsilon Andromedae 49 Paleontologist 49 moons orbiting Saturn 49 Martian craters 49 Cosmologist 49 Oceanographer 49 Earthlike planets 49 Kitt Peak 49 THEMIS 49 infrared astronomy 49 Don Gurnett 49 Enrico Fermi Institute 49 evolutionary geneticist 48 Postdoctoral Fellow 48 Kip Thorne 48 comets orbiting 48 journal Geophysical Research 48 Cosmologists 48 Peter Jenniskens 48 geophysicists 48 Microbiologist Cynan Ellis 48 Adaptive Optics 48 cosmology 48 Horizons Principal Investigator 48 Gidon Eshel 48 Carle Pieters 48 Vikhlinin 48 Caspar Ammann 48 orbiting gamma ray 48 Alex Filippenko 48 Extra Terrestrial Intelligence 48 Geoffrey Marcy 48 Compact Reconnaissance Imaging Spectrometer 48 RRATs 48 Mandushev 48 chemical oceanographer 48 Hamish Pritchard 48 HHMI investigator 48 Eric Rignot 48 MARSIS 48 rocky planets 48 BioServe Space Technologies 48 Relations Observatory STEREO 48 CERN physicist 48 YORP effect 48 bioengineering professor 48 ultraviolet spectrometer 48 Lewis Dartnell 48 Nathan Kaib 48 Gnedin 48 WM Keck Observatory 48 supersymmetric particles 48 Extraterrestrial Intelligence Institute 48 DISR 48 sedimentologist 48 Earthlike planet 48 Director Charles Elachi 48 planetary missions 48 neuroscientist 48 Atmospheric Science 48 planetary exploration 48 Astrophysical Research 48 Brookhaven physicist 48 Werthimer 48 Zarnecki 48 Cosmic Background Explorer 48 Manchester Jodrell Bank 48 Observatories 48 Shallow Radar instrument 48 Niels Bohr Institute 48 Foing 48 Nasa Kepler 48 bioengineer 48 cometary 48 EPOCh 48 Svensmark 48 Volker Bromm 48 Composite Infrared Spectrometer 48 Meteorite Studies 48 distant supernovae 48 Jill Tarter 48 journal Meteoritics 48 Brownlee Stardust 48 Richard Binzel professor 48 palaeontologist Dr 48 Inez Fung 48 Helioseismic 48 Geological Sciences 48 doctoral student 48 Son Nghiem 48 comets 48 Mewaldt 48 Geological Survey volcanologist 48 Astromaterials Research 48 Associate Professor 48 protoplanetary disks 48 Bonnie Buratti 48 planetary atmospheres 48 Roger Pielke Jr 48 Jack Lissauer 48 Ken Edgett 48 astrophysical phenomena 48 palaeoanthropologist 48 Stadermann 48 cosmic collisions 48 Geophysics 48 telescope 48 sterile neutrino 48 botany professor 48 physicists 48 imaging spectrometer 48 Huygens mission 48 Applied Physics Lab 48 Verbiscer 48 Astrophysical Journal Letters 48 Space Telescope Science 48 geodynamics 48 Galilean satellites 48 SSRL 48 Mario Livio 48 neutron spectrometer 48 gamma ray observatory 48 Coauthor 48 FORCAST 48 Carnegie Institution Geophysical 48 Tad Pfeffer 48 anthropology professor 48 volcanologist 48 oceanography professor 48 LCROSS scientist 48 Pluto Charon 48 JILA joint 48 Kuiper belt 47 SwRI 47 MPIfR 47 Jean Luc Margot 47 Armagh Observatory 47 coauthor 47 HD#b 47 ESA Integral 47 Neutral Mass Spectrometer 47 Owen Gingerich 47 Paleoanthropologist 47 Magnetic Imager 47 Atmospheric Physics 47 Kirschvink 47 Pasachoff 47 Astrophysics Laboratory 47 postdoctoral research 47 limnologist 47 JPL manages 47 Stanford Synchrotron Radiation Lightsource 47 HD #b [002] 47 ESO VLT 47 Priscu 47 Friis Christensen 47 exosphere 47 SNfactory 47 Fermi Gamma ray 47 gaseous planet 47 permanently shadowed craters 47 astrometry 47 LASP 47 Ketterle 47 CSIRO Wealth 47 NASA Infrared Telescope 47 evolutionary anthropologist 47 Saturn rings 47 JILA 47 Astrophysics MOA 47 Wick Haxton 47 Hydrospheric 47 Postdoctoral fellow 47 Harvard Smithsonian CfA 47 potentially habitable planets 47 Jakosky 47 Haystack Observatory 47 Mini TES 47 gravitational lensing 47 Thomas Keprta 47 magnetospheric imaging instrument 47 Observatory NOAO 47 Max Planck Institute 47 Observatory LDEO 47 molecular geneticist 47 optical interferometry 47 John Zarnecki 47 seismology 47 Planck satellite 47 Eric Steig 47 Gerhard Schwehm 47 Geophysicist 47 Heasler 47 Jay Melosh planetary geologist 47 professor 47 Kazantzidis 47 ESO astronomer 47 Astronomical Observatory 47 gravitational microlensing 47 Scheeres 47 Zolensky 47 protoplanet 47 Fermi LAT 47 Observatory SDO 47 Gravitational waves 47 roboticist 47 Katzman Automatic 47 Cosmic Microwave Background 47 Space.com 47 Budker 47 Jim Kasting 47 Laboratory Pasadena 47 moon Ganymede 47 orbiting Chandra 47 Research Institute NSBRI 47 Seismological Laboratory 47 MIT Kavli Institute 47 Geophysical Union 47 cryosphere 47 biochemist 47 Hap McSween 47 cosmologists 47 Kevin Schawinski 47 Bethany Ehlmann 47 Valles Marineris 47 astrophotographer 47 Dan Durda 47 Decadal Survey 47 ESA XMM Newton 47 MIT prof 47 Institute SwRI 47 tholins 47 Anisotropy Probe WMAP 47 Magnetic Imager HMI 47 Ted Scambos glaciologist 47 Observatory LIGO 47 wildlife ecologist 47 Kawaler 47 seismology lab 47 Spaceguard 47 Astronomical Society 47 Comet #P 47 X ray wavelengths 47 V. Ramanathan 47 Saturnian moon Titan 47 Gerald Meehl 47 vertebrate zoology 47 Kashlinsky 47 Climatologist 47 asteroids 47 Squyres 47 Wingenter 47 cryovolcanism 47 Roger Pielke 47 meteoroid 47 Forensic anthropologist 47 subsurface ocean 47 DEEP2 47 Planetary Society 47 Bramley Murton 47 Donald Johanson 47 Natalia Rybczynski 47 planets 46 Postdoctoral Researcher 46 Lyot 46 Lunar Prospector 46 Roukes 46 Explorer WISE 46 infrared telescope 46 GALEX 46 Waleed Abdalati 46 Cynthia Rosenzweig 46 Anthropologist 46 pulsating aurora 46 Gregory Benford 46 microlensing 46 High Angular Resolution 46 zoologist 46 Cometary 46 Atmospheric Research 46 Earth asteroids 46 Adrian Melott 46 cosmic ray 46 telescopes 46 Professor Chandra Wickramasinghe 46 moons circling 46 Asantha Cooray 46 COROT 46 Astronomers 46 Grammier 46 ray Space Telescope 46 Submillimeter Array 46 submillimeter wavelengths 46 Georgi Mandushev 46 Gregory Asner 46 Martin Haehnelt 46 Earth Observatory 46 Radio Astronomy Observatory 46 JWST 46 interstellar cloud 46 mathematical physicist 46 SwRI Space 46 Bette Otto Bliesner 46 Nousek 46 NASA THEMIS 46 high temperature superconductivity 46 Saturn Cassini 46 Drew Shindell 46 Exoplanet 46 Sandra Pizzarello 46 entomology professor 46 Tranquada 46 Geophysicists 46 Kieda 46 asteroidal 46 USGS scientist 46 Jere Lipps 46 Ajit Varki 46 Hubble observations 46 Ross Salawitch 46 geophysics 46 cosmic ray flux 46 Kailash Sahu 46 Kuiper belt object 46 atmospheric sciences professor 46 Jianjun Yin 46 Nature Geoscience 46 martian surface 46 WIYN Observatory 46 Moon Mineralogy Mapper M3 46 astronautics 46 Raymond Jeanloz 46 Infrared Mapping Spectrometer 46 photosphere 46 observational cosmology 46 gravitational lenses 46 Interstellar Boundary Explorer 46 biogeochemistry 46 NASA Goddard Spaceflight 46 plant physiologist 46 David Awschalom 46 Schawinski 46 gamma ray telescope 46 Geophysical Research 46 quasars 46 Dr. Daniel Geschwind 46 Wolfgang Brandner 46 Craig Tooley LRO 46 highly elliptical orbits 46 Arizona Steward Observatory 46 Planetary Transits 46 Climate Experiment GRACE 46 Ph.D. Associate Professor 46 Alycia Weinberger 46 Observatory 46 celestial object 46 Climatic Research 46 Tod Strohmayer 46 doctoral researcher 46 inorganic chemist 46 mammalogist 46 KBOs 46 James Gimzewski 46 Planetary Geosciences Institute 46 asteroid 46 Harald Ebeling 46 Oceanographers 46 Conductivity Analyzer 46 UKIRT 46 Seth Shostak 46 COROT 7b 46 Fomalhaut b 46 infrared observatory 46 William Happer 46 X ray observatory 46 optical telescopes 46 Mackay Sim 46 Robock 46 Fundamental Physics 46 AERONET 46 anthropologist 46 Elachi 46 infrared telescopes 46 Nasa 46 spokeswoman Kylie Clem 46 NASA Wilkinson Microwave 46 Erik Hauri 46 BP Psc 46 infrared spectrograph 46 Gaensler 46 Rasio 46 London Mullard Space 46 astronomer Seth Shostak 46 Jon Giorgini 46 Dan Werthimer 46 Oceans Flagship 46 Saturn moons 46 Institut d' Astrophysique de 46 Thermal Emission Spectrometer 46 Reentry Debris Studies 46 vulcanologist 46 Stephen Palumbi 46 Squyers 46 Ed Weiler 46 Gaetano Di Achille 46 paleobotanist 46 Hari Manoharan 46 Hyakutake 46 ammonia hydrates 46 Spectroscopic Explorer 46 Space Studies GISS 46 Laura Grego 46 Enceladus 46 Near Infrared Camera 46 paleontology 46 X ray telescope 46 emeritus professor 46 asteroids comets 46 David Wettergreen 46 SDSS II 46 De Pontieu 46 Michael A'Hearn 46 Infrared Pathfinder Satellite 46 Spaceweather.com 46 IBM Almaden Research 46 Jonathan Overpeck climate 46 Leiden Observatory 46 Ziurys 46 van Geen 46 microbiologist 46 CU Boulder doctoral 46 SRON Netherlands Institute 46 Hod Lipson 46 Tegmark 45 Andrei Linde 45 Brookhaven chemist 45 Oort cloud 45 NASA Heliophysics 45 planetary orbits 45 behavioral neuroscientist 45 Joe Veverka 45 ejecta 45 astronomical objects 45 Comet Hale Bopp 45 Cassini flyby 45 Matese 45 Alex Zettl 45 psychology professor 45 oceanic sciences 45 Tarduno 45 Rusty Schweickart 45 Cassini Huygens 45 Nevada Seismological Laboratory 45 Vulcanologist 45 conservation biologist 45 telescopic observations 45 Rainer Klement 45 LOFAR 45 Dr Glikson 45 comets meteors 45 paleobiology 45 Paul Spudis 45 Planetary Science Division 45 Royal Astronomical Society 45 Wide Angle Search 45 Martian soil 45 Arecibo Observatory 45 Electorate Nominating Committee 45 Berkeley Seismological Laboratory 45 HiRISE camera aboard 45 comet McNaught 45 forest ecologist 45 RXTE 45 George Djorgovski 45 VIRTIS 45 bio ethicist 45 Dry Valleys 45 HiRISE camera 45 NASA Jet Propulsion 45 Siding Spring 45 Upsilon Andromedae b 45 habitable worlds 45 Christophe Lovis 45 Hollander associate professor 45 Neil Gehrels 45 chemical oceanography 45 Chris Lintott 45 supervolcanoes 45 Humberto Campins 45 Andrew Fraknoi 45 WMAP satellite 45 Biochemist 45 Caltech 45 Emily Lakdawalla 45 Kenneth Nealson 45 evolutionary psychologist 45 greatest insect emergences 45 Perseus Cluster 45 theoretical cosmologist 45 particle detectors 45 geographer 45 Marika Holland 45 Ken Caldeira 45 noctilucent clouds 45 S. Lindzen 45 Sipiera 45 LLNL 45 lunar crust 45 spacecraft thrusters 45 Earthlike 45 Cenko 45 Katlenburg Lindau Germany 45 particle astrophysics 45 Optical Gravitational Lensing Experiment 45 journal Geology 45 NIWA scientist 45 Evolutionary biologist 45 Fermi telescope 45 Syun Ichi Akasofu 45 Max Planck Institut fuer 45 Solar Terrestrial Physics 45 retrograde orbits 45 amateur astronomer 45 USGS geophysicist 45 axion 45 GRB #B 45 Galactic cosmic rays 45 Genome Sequencing Center 45 Long Wavelength Array 45 LCROSS mission 45 neurophysiologist 45 heliosphere 45 Tom Krimigis 45 Vladimir Shalaev 45 Japan NAOJ 45 ultraviolet spectrograph 45 Colaprete 45 gravitational waves 45 gamma ray astronomy 45 PSR B# +# 45 Shaposhnikov 45 Earthscope 45 Chicxulub 45 Fonstad 45 Explorer IBEX 45 Margarita Marinova 45 physics 45 Otto Bliesner 45 cosmic microwave background 45 phyllosilicates 45 Jean Pierre Bibring 45 Solar System 45 theoretical physicists 45 X ray telescopes 45 geoarchaeologist 45 observatory 45 cometary dust 45 Nasa spacecraft 45 magnetic reconnection 45 WASP #b 45 Astrophysics CfA 45 Awschalom 45 PALCA 45 habitable planet 45 Principal Investigator PI 45 cosmic microwave radiation 45 Lunar Reconnaissance 45 Lars Hernquist 45 C. Altschuler 45 postdoc 45 Ultraviolet Imaging Spectrograph UVIS 45 Jane Ferrigno 45 author Eugene Takle 45 Paquay 45 dimming starlight 45 Neutron Detector 45 paleoclimatology 45 Felisa Wolfe Simon 45 Gael Chauvin 45 Vourlidas 45 Volatile Evolution 45 atmospheric aerosols 45 Dava Newman 45 X ray spectrometer 45 Kurt Retherford 45 cosmological distances 45 OSIRIS REx 45 National Astronomical Observatory 45 credit NASA JPL 45 Leslie Orgel