Related by context. Frequent words. (Click for all words.) 60 quantum mechanics 59 Einstein theory 58 quantum physics 58 quantum theory 57 Newtonian 57 cosmology 57 cosmological 57 quantum entanglement 56 physics 56 interplanetary spacecraft 56 Brownian motion 55 cosmic 55 gravitational lensing 55 astronomy 55 celestial bodies 54 astronomical observations 54 astrophysical 54 thermodynamics 54 general relativity 54 gravitation 54 spacetime 54 quantum gravity 53 theorems 53 differential equations 53 observable universe 53 particle physics 53 Johannes Kepler 53 quantum mechanical 53 singularities 52 dynamical 52 theoretic 52 celestial 52 Earth magnetosphere 51 particle physicists 51 gravitational 51 occultation 51 astrophysics 51 scalar 51 high temperature superconductivity 51 Fourier 51 E = mc2 51 cosmos 51 supersymmetry 51 relativistic 51 relativity 50 gravitational wave 50 interferometry 50 outer planets 50 fractals 50 planetary 50 sundials 50 Pythagoras 49 magnetic fields 49 subatomic 49 theoretical physics 49 mathematical 49 geometry 49 classical antiquity 49 astronomical objects 49 metaphysics 49 scientism 49 celestial object 49 electromagnetism 49 symmetries 49 scanning tunneling microscope 49 cosmic ray 49 theoretical physicist 49 temporal 49 pendulums 48 adaptive optics 48 parapsychology 48 Leibniz 48 Einstein 48 Aristotelian 48 phenomenology 48 QCD 48 atomic nucleus 48 ionospheric 48 numerical simulations 48 thermodynamic 48 magnetic flux 48 galaxy formation 48 geometrical 48 theoretical physicists 48 plasmonics 48 planetary science 48 mathematical calculations 47 theoretical 47 optical microscopy 47 cosmological constant 47 hermeneutics 47 automata 47 meteoroid 47 physicist 47 parallax 47 magnetosphere 47 physicists 47 ontology 47 Kuiper belt 47 cosmologists 47 Richard Feynman