Related by context. Frequent words. (Click for all words.) 73 gravitational pull 65 magnetic fields 64 neutron star 61 magnetic 60 gravity 57 galaxies 56 cosmic 56 general relativity 56 electromagnetic 55 hydrogen atoms 55 electrons 55 vortices 55 electron 55 atoms 54 quasar 54 neutrinos 54 cosmic rays 53 Einstein theory 53 velocities 53 neutron stars 53 orbits 53 pulsar 52 galactic 52 supermassive black holes 52 quasars 52 galaxy 51 particles 51 gamma rays 51 Milky Way 51 neutrons 51 quarks 51 proton 51 subatomic particles 51 interstellar 50 photons 50 oscillations 50 planets 50 ionosphere 50 planetary 50 nuclei 50 distant galaxies 50 celestial bodies 49 supernovae 49 luminosity 49 outer layers 49 ions 49 entropy 48 protons 48 nebula 48 quantum mechanics 48 particle 48 starlight 48 vibrations 47 cosmos 47 astrophysicists 47 solar flares 47 Enceladus 47 quark 47 Uranus 47 atmospheric 46 universe 46 magnetism 46 superconductivity 46 water vapor 46 curvature 46 relativity 46 orbiting 46 impactor 45 asteroid 45 gamma ray bursts 45 interstellar space 45 cosmological 45 photon 45 supernova 45 Milky Way galaxy 45 magnetized 45 comets 45 refractive index 45 electrical conductivity 45 gamma ray 45 deformation 44 vortex 44 comet 44 orbital 44 diffraction 44 electrostatic 44 spherical 44 exoplanets 44 quantum physics 44 gaseous 44 physics 44 chemical reactions 44 Saturn rings 43 tectonic 43 refraction 43 pulsars 43 convection 43 filaments 43 superconducting 43 asteroids 43 oscillation