Related by context. Frequent words. (Click for all words.) 55 R. Buckminster Fuller 52 Tycho Brahe 52 Vikram Sarabhai 51 astronomy 51 Nicolaus Copernicus 50 Galileo Galilei 50 Edwin Hubble 50 Johannes Kepler 50 astronomical telescope 50 Steward Observatory 50 interplanetary spacecraft 49 Charles Babbage 49 Richard Feynman 48 Gregor Mendel 48 EarthScope 47 Gravity Probe B 47 Paul Dirac 46 Niels Bohr 46 astronomer 46 Guglielmo Marconi 46 physicist Albert Einstein 46 physicist 46 astrophysics 46 Galileo telescope 46 elementary particle physics 46 Einstein 46 Wernher von Braun 46 Consolmagno 46 telescope 45 classical antiquity 45 Voyager spacecraft 45 Clyde Tombaugh 45 Arecibo Observatory 45 Antikythera Mechanism 45 John Logie Baird 45 fractal geometry 45 Wilkinson Microwave Anisotropy Probe 45 mathematician 45 Viking landers 45 King Sejong 45 STScI 45 spaceborne 44 COBE 44 National Astronomical Observatory 44 astronautics 44 Astronomer 44 astronomical observatory 44 photoelectric effect 44 Roger Penrose 44 observatory 44 Buckminster Fuller 44 Homi Bhabha 44 TIFR 44 Madame Curie 44 photometry 44 astronomical observations 43 satellite Sputnik 43 quantum optics 43 NASA Goddard 43 Caltech 43 WM Keck 43 Werner Heisenberg 43 Roger Kornberg 43 Very Large Array 43 Bahcall 43 Compton Gamma Ray 43 Lick Observatory 43 Jacques Yves Cousteau 43 Thomas Alva Edison 42 Apollo missions 42 inventor Nikola Tesla 42 Astronomy 42 Carl Sagan 42 NASA JPL 42 maser 42 heliocentric 42 Gehrels 42 Einstein theories 42 Apollo lunar 42 Kroto 42 Edward Teller 42 CubeSat 42 interferometry 42 Palomar Observatory 42 astronomer Carl Sagan 42 Mars Pathfinder 42 National Optical Astronomy 42 cosmic microwave background 42 astrophysicist 42 Astrophysicist 41 Pasachoff 41 Maria Montessori 41 geodesy 41 cosmonaut Yuri Gagarin 41 LOFAR 41 frequency comb 41 Subaru Telescope 41 Paracelsus 41 Rudolf Diesel 41 Goce 41 philologist