Related by context. Frequent words. (Click for all words.) 76 Einstein theory 69 quantum mechanics 67 relativity 63 cosmological 62 cosmology 60 particle physics 60 quantum physics 58 quasars 58 galaxy clusters 56 neutron star 56 gravitational 56 supernovae 55 quantum mechanical 55 distant galaxies 55 neutron stars 55 physics 54 galaxies 54 subatomic particles 54 astrophysicists 54 theorem 53 brown dwarfs 53 theoretical physicist 53 magnetic fields 53 neutrinos 53 thermodynamics 53 antimatter 52 quasar 52 Higgs boson 52 gamma ray bursts 52 supernovas 52 astrophysics 51 physicists 51 astronomers 51 Saturn rings 51 superconductivity 51 cosmos 50 supermassive black holes 50 planets 50 extrasolar planets 50 photons 50 cosmic 49 Einstein 49 supernova 49 cosmic rays 49 pulsars 49 theoretical physics 49 celestial bodies 48 Milky Way galaxy 48 particle 48 photon 48 relativistic 47 singularity 47 exoplanets 47 quarks 47 exoplanet 47 atoms 47 evolutionary theory 47 Astrophysical Journal 47 diffraction 47 theory 46 adaptive optics 46 physicist 46 Physicists 46 gamma ray burst 46 gravitation 46 electron 46 astronomy 46 supermassive black hole 46 magnetosphere 46 protons 46 particles 46 astronomer 46 vortices 46 metamaterials 46 Milky Way 45 luminosity 45 quark 45 galaxy 45 gamma rays 45 proton 45 Enceladus 45 velocities 45 Tevatron 45 comet 45 gamma ray 45 geometry 45 macroscopic 45 geometries 45 Physicist 44 comets 44 spectroscopy 44 geometrical 44 Darwin theory 44 infrared wavelengths 44 Big Bang 44 Darwinian evolution 44 mathematician 44 quantum computing 44 mathematical 44 pulsar 44 nanometer scale