## Introducing RelativityThis book begins with life near the speed of life near the speed of ligh and explores idas of of space-time and curved space. |

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20th century Alan Guth atoms black holes Bruce Bassett Copernican principle Cosmic cosmological constant cosmologists cosmology critical density curved space cylinder dark matter dimensional earth Einstein's equations Einstein's field equations electric and magnetic electromagnetic electrons equivalence principle example extrinsic curvature flat space Flatness Problem FLRW models force acting four-dimensional galaxies geodesics geometry George Ellis gravitational waves idea infinite number interferometer landscape lcon Books lf the universe lmagine ln fact magnetic fields mathematics metric moving Newton's first law Newton's theory normal vectors numbers to specify observations orbit parallel geodesics parallel lines particle perihelion physicists Planck's constant planets positively curved prediction of GR problem quantum effects rocket Shake a mass sheet of paper shortest distance Singularity Theorems Slicing Spacetime spacelike spacetime special relativity speed of light stars straight lines theory of gravity Theory of Relativity three space dimensions timelike triangle twin types of curvature unified wavelength