Related by context. Frequent words. (Click for all words.) 64 gravitational attraction 60 spacetime 58 gravitational 58 gravitationally 58 gravitational pull 57 lithosphere 57 magnetic fields 56 Earth magnetosphere 56 magnetosphere 56 gravitational tug 55 angular momentum 54 meteoroids 54 ionized gas 54 orbits 54 magnetic flux 54 planets 54 atomic nuclei 54 Kuiper belt 54 gravitation 53 fermions 53 neutron star 53 accretion disk 52 torus 52 phonons 52 Brownian motion 52 gravitational waves 52 crystal lattice 52 dynamical 52 X ray emission 52 heliosphere 52 excitons 51 galaxy clusters 51 Saturn moons 51 nebulae 51 galaxies 51 starbursts 51 orbiting 51 landmasses 51 super Earths 51 atoms 51 symmetries 50 quanta 50 asteroids 50 hydrogen atoms 50 Iapetus 50 Jupiter Saturn Uranus 50 interstellar medium 50 nuclei 50 galaxy formation 50 earths 50 vortices 50 terrestrial planets 50 dwarf galaxy 50 planet orbits 50 perturbations 50 Uranus 50 ionosphere 50 geomagnetic storms 50 celestial bodies 50 radioactive decay 50 supernova explosion 50 spherical 50 supernova explosions 50 neutron stars 50 gravity 50 superfluid 50 coronal mass ejections 50 Jupiter Saturn 49 oscillations 49 spiral galaxies 49 atomic nucleus 49 hot Jupiters 49 cosmos 49 solar flares 49 habitable planets 49 GRBs 49 atomic particles 49 WIMPs 49 centrifugal forces 49 electrons 49 ejecta 49 interstellar dust 49 galaxy cluster 49 outer planets 49 planetary 49 magnetar 49 habitable planet 48 numerical simulations 48 globular cluster 48 quasars 48 meteoroid 48 terahertz radiation 48 cosmic rays 48 alpha particles 48 brown dwarfs 48 Jupiter moons 48 neutrons 48 supermassive black holes 48 galaxy 48 Andromeda galaxy 48 photons