Related by context. Frequent words. (Click for all words.) 61 gravitational 56 gravitational pull 55 Newtonian 54 dynamical 52 spacetime 52 relativity 51 relativistic 51 quantum mechanics 50 gravity 50 angular momentum 49 quantum mechanical 48 physics 48 entropy 48 thermodynamics 48 astrophysical 48 quantum physics 47 precession 46 general relativity 46 Einstein theory 46 atomic nuclei 46 quantum theory 45 celestial bodies 45 cosmic 45 cosmological 45 coalescence 44 cosmology 44 Isaac Newton 43 repulsion 43 singularity 43 magnetic fields 43 oscillations 43 refraction 43 electromagnetism 43 atoms 43 phenomena 43 gravitational waves 43 physicists 42 Uranus 42 cosmos 42 superposition 42 heliosphere 42 vortices 42 oscillation 42 electrons 42 cosmologists 42 astrophysicists 42 orbits 42 equations 41 planets 41 interstellar dust 41 inertial 41 magnetization 41 perturbations 41 vibrational 41 electron 41 planetary 41 immutable 41 geomagnetic 41 subatomic 41 cosmic dust 41 neutron stars 41 hydrogen atom 41 outer planets 41 magnetosphere 40 universe 40 centrifugal force 40 rotational 40 neutron star 40 magnetism 40 supernova explosion 40 hydrogen atoms 40 ineluctable 40 plate tectonics 40 scalar 40 magnetic 40 planet orbiting 40 radioactive decay 40 galaxies 40 degeneracy 40 reorientation 40 spiral galaxies 40 multiverse 39 interstellar medium 39 perturbation 39 superconductivity 39 fractals 39 inertia 39 geometrical 39 vortex 39 pulsar 39 hydrodynamic 39 periodicity 39 elliptical orbit 39 gluons 39 moons 39 orbital 39 globular clusters 39 neutrinos 39 tectonics 39 electron spin 38 atomic particles