Related by context. Frequent words. (Click for all words.) 47 astronomer 45 astrophysicist 45 Astrophysicist 44 theoretical physicist 44 cosmologist 43 planetary scientist 43 Mathematician 42 National Astronomical Observatory 42 physicist 42 Richard Feynman 42 Astrophysicists 42 mathematician 42 Credit NASA JPL 41 Mario R. Capecchi 41 Johannes Kepler 41 Gamma ray bursts 41 CfA 40 superfluidity 40 Astronomer 40 Kavli Institute 40 Paul Dirac 40 supernova 40 multistate Mega Millions 40 scientist 40 Smithsonian Astrophysical Observatory 40 Thomas Steitz 40 Galaxy Evolution 40 Phil Plait 40 astrophysicists 40 Ada Yonath 39 Caltech 39 Filippenko 39 Astrophysical Journal Letters 39 Nobelist 39 magnetar 39 biophysicist 39 astronomy 39 Cosmologists 39 Nobel Laureate 39 Shinya Yamanaka 39 astronomers 39 distant galaxy 38 physicists 38 Cassini imaging 38 cosmology 38 Postdoctoral Fellow 38 Bahcall 38 physics 38 Mario Capecchi 38 photoelectric effect 38 Neil deGrasse Tyson 38 Gehrels 38 Planetary Institute 38 quasars 38 astrophysics 38 particle physicist 38 University Lamont Doherty 38 neurobiologist 38 gamma ray bursts 38 Nicolaus Copernicus 38 Physicist 37 Halley Comet 37 supernovas 37 roboticist 37 lottery 37 atmospheric scientist 37 aurora borealis 37 theorist 37 interplanetary spacecraft 37 CalTech 37 NASA Astrobiology Institute 37 Niels Bohr Institute 37 extrasolar planet 37 Blaise Pascal 37 Daniel Kahneman 37 Michio Kaku 37 STScI 36 National Optical Astronomy 36 Nobel laureate 36 Halley comet 36 astronomer Carl Sagan 36 Nobel Prize Winner 36 WM Keck Observatory 36 cosmologists 36 supernova remnant 36 Lick Observatory 36 mathematicians 36 Planetary Laboratory 36 Clyde Tombaugh 36 colliding galaxies 36 Bad Astronomy 36 Konstantin Novoselov 36 Emeritus Professor 36 WASP #b 36 mathematical 36 active galactic nuclei 36 Hawking radiation 36 NASA Goddard 36 gamma ray burst 36 Astrophysics 36 subatomic particle