Related by context. Frequent words. (Click for all words.) 73 gravitational 56 gravitation 56 gravity 55 neutron star 51 vortex 51 orbits 50 galaxy clusters 50 magnetic fields 50 supermassive black hole 49 galaxy 48 orbiting 48 elliptical orbit 47 centrifugal force 47 galaxies 46 gravitational waves 46 supermassive black holes 46 Milky Way 46 cosmic 45 neutrinos 45 magnetosphere 45 planets 45 luminosity 45 supernova 44 galactic 43 magnetic 43 quasar 43 vortices 43 quasars 43 nebula 43 magnetism 42 neutron stars 42 suns 42 hydrogen atoms 42 outer layers 42 asteroid 42 orbit 42 gamma rays 42 universe 42 astrophysicists 41 jet stream 41 Milky Way galaxy 41 cosmos 41 cosmic rays 41 entropy 41 orbited 41 velocities 41 Uranus 41 brown dwarfs 41 neutrons 41 gamma ray burst 41 starlight 41 planetary 40 relativity 40 distant galaxies 40 Einstein theory 40 relativistic 40 atoms 40 cosmic radiation 40 convection 40 pulsar 40 comet 39 quarks 39 interstellar 39 brown dwarf 39 Jupiter 39 neutrino 39 general relativity 39 water vapor 39 wind shear 39 singularity 39 inertia 39 infrared radiation 39 oscillations 39 quark 39 Solar System 39 redshift 39 planets orbiting 38 Sedna 38 troposphere 38 electrons 38 asteroid belt 38 magnetized 38 curvature 38 oscillation 38 ionosphere 38 fainter 38 wobble 38 asteroids 38 currents 38 particles 38 celestial bodies 38 photons 38 supernovas 38 refractive index 37 planet 37 equator 37 deuterium 37 astronomers 37 impactor 37 Galaxies 37 electron