Related by context. Frequent words. (Click for all words.) 67 quasars 67 cosmic rays 67 distant galaxies 66 neutron star 66 gamma ray bursts 66 neutron stars 65 galaxy clusters 65 supernovae 64 gamma rays 64 galaxies 64 neutrinos 64 quasar 64 magnetic fields 63 neutrino 62 supermassive black holes 62 gamma ray burst 61 photons 61 subatomic particles 61 general relativity 60 pulsars 60 supermassive black hole 60 extrasolar planets 59 pulsar 59 supernovas 58 astronomers 58 exoplanets 58 solar flares 58 comets 57 comet 57 infrared radiation 57 Einstein theory 57 planets 56 supernova 56 vortices 56 magnetosphere 56 astrophysicists 56 ionosphere 56 Milky Way galaxy 56 gamma ray 56 photon 56 exoplanet 56 brown dwarfs 56 auroras 56 electrons 55 gravitational 55 Higgs boson 55 galaxy 55 Milky Way 54 asteroids 54 neutrons 54 Saturn rings 53 GRB 53 particles 53 Enceladus 53 Astronomers 53 seismic waves 52 sunspots 52 asteroid 52 oscillations 52 protons 52 aurora 52 celestial bodies 52 antimatter 51 electron 51 atoms 51 Astrophysical Journal 50 cosmic 50 planets orbiting 50 quantum mechanical 50 quantum mechanics 50 cosmos 50 cosmological 50 celestial objects 50 proton 50 infrared wavelengths 50 brown dwarf 50 nebula 50 water vapor 50 Solar System 49 vibrational 49 hydrogen atoms 49 electromagnetic waves 49 particle 49 Planck 49 Astrophysics 49 galactic 49 velocities 49 cosmology 49 volcanism 48 ions 48 ionization 48 nuclei 48 quark 48 electromagnetic radiation 48 meteors 48 astrophysics 48 organic molecules 48 starlight 48 telescopes 48 spectroscopy 48 cosmic radiation