## The ABC of Relativity |

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aether appear assume astronomers atom body centre chapter clocks clusters of galaxies concerned conservation conventional cosmological principle depend direction distance in space earth earth-dweller effect Einstein Einstein's law electrons equally estimate Euclidean Euclidean geometry exactly experiment expressed fact foot-rule force formula Galileo geodesic geography geometry happened highly condensed hill hydrogen infer kinetic energy law of gravitation less light-rays light-waves logical longer Lorentz Lorentz transformation mathematical matter mean measured Michelson-Morley experiment miles motion moving relatively nature Newton's object observer occurred particles perihelion physical laws physical world physicist planets point of view possible potential energy protons quantities quantum theory question reason red-shifts regarded region relativity theory right angles round the sun seen sense solar system space-time special theory square stars straight lines suppose surface swarms tell theory of relativity thing thought tion train triangle uniform universe velocity of light whole