## The riddle of gravitation |

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### Contents

Early History | 9 |

Relativity of Motion | 19 |

The Universal Speed of Light | 25 |

Copyright | |

90 other sections not shown

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### Common terms and phrases

astronomical atoms axes axis called clocks components conservation continuum coordinate system covariance curvature curved density depends determined direction distance double star earth effects Einstein electric charges energy equal finite force four-dimensional frame of reference free-falling frame frequency galaxies geometry gravitational accelerations gravitational field gravitational radiation gravitational waves hence inertial frame instance interactions known large mass law of gravitation light cone light signals lightlike linear momentum Lorentz frame Lorentz transformation magnetic magnitude manifold mathematical matter Minkowski universe motion Newton's objects observer orbit parallel transport particles perihelion planet principle of equivalence propagation QSOs quantities quantum theory red shift relationship relativistic represent respect rest result right angles rotation Schwarzschild radius shear space-time spacelike spatial special theory speed of light sphere spherical straight lines surface tensor test bodies theory of gravitation theory of relativity timelike tion trajectory unaccelerated vector velocity white dwarfs world points