Related by context. Frequent words. (Click for all words.) 60 gravitational 60 gravitational pull 54 angular momentum 53 starlight 53 magnetic fields 53 magnetosphere 53 supermassive black hole 52 galaxy cluster 52 supernova explosion 52 galaxy clusters 51 orbits 51 galaxies 51 spacetime 51 neutron star 50 planet orbiting 50 interstellar medium 50 HD #b [002] 50 rocky planets 50 pulsar 49 oscillations 49 planets orbiting 49 planets 48 atomic nuclei 48 heliosphere 48 supermassive black holes 47 dwarf galaxies 47 vortices 47 neutron stars 47 orbiting 47 distant galaxy 46 gravitation 46 centrifugal force 46 X ray Observatory 46 galaxy 46 quasar 46 asteroid belt 46 quasars 45 atoms 45 spiral galaxies 45 Iapetus 45 gravitational waves 45 magnetization 45 interstellar dust 45 hydrogen atoms 45 nuclei 45 galactic 45 elliptical orbit 45 outer layers 45 nebulae 45 electrons 45 outer planets 45 luminosity 44 brown dwarf 44 distant galaxies 44 celestial bodies 44 asteroid 44 nebula 44 entropy 44 brown dwarfs 44 Milky Way Galaxy 44 deuterium 44 Andromeda 44 asteroids 43 gravity 43 redshift 43 oscillation 43 Milky Way galaxy 43 gamma ray burst 43 positrons 43 Spitzer Space Telescope 43 radioactive decay 43 perturbation 43 amplitudes 43 convective 43 atomic particles 43 Earth crust 43 gamma rays 43 neutrinos 42 exoplanet 42 supernovae 42 neutrons 42 magnetic 42 electron 42 globular clusters 42 hydrogen atom 42 infrared wavelengths 42 extrasolar planet 42 cosmic microwave background 42 cosmic 42 tectonic 42 interstellar 42 dynamical 42 cosmic ray 42 spiral galaxy 42 laser pulse 42 atmospheric circulation 42 NASA Cassini spacecraft 42 Betelgeuse 42 XMM Newton 42 exoplanets 41 Uranus