Related by context. Frequent words. (Click for all words.) 59 planetary scientist 58 astronomer 58 Gliese #g 57 habitable planets 54 Carolyn Porco 54 extrasolar planet 54 Astrophysicist 53 extrasolar planets 52 Phil Plait 52 Cassini imaging 52 astronomers 52 WIMPs 51 rocky planets 51 astrophysicist 51 meteoroid 51 astrophysical 51 solar corona 51 astrobiologists 51 A'Hearn 51 Astrophysicists 50 exoplanet 50 cosmologist 50 astrophysicists 50 Planetary Laboratory 50 astronomical observations 50 optical telescopes 50 HD #b [002] 50 Credit NASA JPL 50 Michael A'Hearn 50 Carnegie Institution 49 quasars 49 exoplanets 49 astrobiologist 49 particle physicist 49 planets circling 49 theoretical physicist 49 Colaprete 49 Keck Observatory 49 Serreze 49 cosmic microwave background 49 Pan STARRS 49 Niels Bohr Institute 49 terrestrial planets 49 GRBs 49 shorter wavelengths 49 interstellar dust 49 Lowell Observatory 49 planetary nebulae 48 Neil deGrasse Tyson 48 atmospheric scientist 48 supermoon 48 PALCA 48 brown dwarfs 48 planetary science 48 Astronomer 48 gravitational waves 48 Gamma ray bursts 48 physicists 48 planets orbiting 48 gravitational wave 48 Very Large Array 48 planet orbiting 48 Kuiper belt 47 UB# [003] 47 Astrophysical Journal 47 cosmologists 47 Astrophysics 47 COROT 47 NASA Kepler 47 Galaxy Evolution 47 Applied Physics Laboratory 47 credit NASA JPL 47 spacetime 47 spherules 47 astrobiology 47 Borucki 47 Don Yeomans 47 moon Europa 47 gamma ray burst 47 alien civilizations 47 unaided eye 47 magnetar 47 astrophysics 47 polar caps 47 Kavli Institute 47 ejecta 47 van Dokkum 47 LIGO 47 Einstein theory 46 pulsars 46 planetoid 46 physicist 46 neutrino 46 microlensing 46 Jet Propulsion Laboratory JPL 46 interplanetary spacecraft 46 meteoroids 46 visible wavelengths 46 atmospheric sciences 46 Astronomy 46 Harvard Smithsonian