Related by context. Frequent words. (Click for all words.) 71 physicists 70 astrophysicists 68 astronomers 62 cosmology 62 cosmological 61 cosmic microwave background 60 general relativity 59 theorists 59 particle physics 59 quantum mechanics 58 Physicists 57 quantum theory 57 Astronomers 57 distant galaxies 57 theoretical physicist 57 gravitational waves 57 gamma ray bursts 57 galaxy clusters 56 supernovae 56 neutrinos 56 brown dwarfs 55 quantum physics 55 Einstein theory 55 quasars 55 extrasolar planets 55 supernovas 55 pulsars 54 cosmic rays 54 galaxies 54 Saturn rings 54 Higgs boson 54 exoplanets 53 antimatter 53 neutron stars 53 redshift 53 Cosmology 53 rocky planets 52 planets 52 neutrino 52 astrophysics 52 mathematicians 52 subatomic particles 52 physicist 52 evolutionists 52 scientists 52 quasar 51 astrophysicist 51 NASA Chandra 51 astronomer 50 cosmic 50 quantum mechanical 50 neutron star 50 supernova 50 cosmos 50 supermassive black holes 50 astrobiology 49 magnetic fields 49 theoretical physics 49 comets 49 metamaterials 49 universe 49 neuroscientists 49 gamma ray burst 48 photons 48 Milky Way galaxy 48 climatologists 48 neutrons 48 exoplanet 48 celestial bodies 48 Space Telescope 48 hydrogen atoms 48 atoms 48 Planck 47 Astronomer 47 planets orbiting 47 astronomy 47 spectroscopic 47 Big Bang 47 physics 47 relativistic 47 planetary scientist 47 quantum computers 46 pulsar 46 comet 46 theologians 46 dynamical 46 Enceladus 46 particle accelerator 46 superconductivity 46 sunspots 46 gamma rays 46 celestial objects 46 synchrotron 46 planetary 46 philosophers 45 protons 45 organic molecules 45 computer simulations 45 brown dwarf 45 quantum computing 45 Kuiper Belt