## The Riddle of GravitationThought-provoking nonmathematical introduction to the conceptual foundations of both Newton's and Einstein's theories of gravitation. Special relativity theory, general relativity theory, other topics. This updated edition features material on gravitational radiation detectors, current problems in cosmology, singularities of the gravitational field, and more. |

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### Contents

Gravitation Is an Attractive Force | 6 |

The InverseSquare Law of Gravitational Attraction | 7 |

Newtons Third Law | 8 |

Copyright | |

86 other sections not shown

### Common terms and phrases

astronomical atoms axis called clocks components continuum coordinate system cosmological covariance curvature curve density depends determined direction distance double star earth effects Einstein electric charges electromagnetic field energy equal equations finite flat force four-dimensional frame of reference free-falling frame galaxies geometry gravitational acceleration gravitational field gravitational radiation gravitational waves hence inertial accelerations inertial frame infinity instance interactions interior large mass light cone light signal lightlike linear momentum Lorentz frame magnetic magnitude manifold mathematical matter Minkowski universe motion Newton's Newtonian physics objects observer orbit original parallel transport particles planet principle of equivalence propagation pulsars quantities quasars ratio redshift region 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 theory of gravitation theory of relativity timelike trajectory unaccelerated values vector velocity whereas world points