Describes the machinery of gravity based on the idea that all matter is expanding forever. Derives equations showing that the intuitive notion that this idea can not be correct because objects of different densities would change sizes is wrong. Instead because nothing can go faster than light speed, objects regardless of densities or geometry converge in sizes such that the ratio of all sizes remain almost time invariant. However, there remains a very small difference in the ratios that can be measured under some conditions and shows up in certain long distance measurements. One example being the three Pioneer 10/11 anomalous accelerations and the apparent (but unexplained) expansion of the earth. The idea is developed and then applied to six problems in physics (bending of starlight, advance of the perihelion of Mercury, behavior of spiral galaxies, expansion of the earth, anomalous acceleration terms for Pioneer 10/11, and acceleration of universe expansion) showing very nice explanations and solutions matching measurement results with (in some cases) simpler solutions than in the literature.

With his talking dog, Frankie, as a constant companion, ten-year-old Cal Barraclough investigates his wacky neighbor's unusual experiments.

Spacetime physics -- Physics in flat spacetime -- The mathematics of curved spacetime -- Einstein's geometric theory of gravity -- Relativistic stars -- The universe -- Gravitational collapse and black holes -- Gravitational waves -- Experimental tests of general relativity -- Frontiers

A small girl finds the machinery that keeps gravity working and decides to spend her life taking care of it, but the people in the nearby village do not understand her choice and will not even supply her with food, until one day two little mice discoveryt

The Feynman Lectures on Gravitation are based on notes prepared during a course on gravitational physics that Richard Feynman taught at Caltech during the 1962-63 academic year. For several years prior to these lectures, Feynman thought long and hard about the fundamental problems in gravitational physics, yet he published very little. These lectures represent a useful record of his viewpoints and some of his insights into gravity and its application to cosmology, superstars, wormholes, and gravitational waves at that particular time. The lectures also contain a number of fascinating digressions and asides on the foundations of physics and other issues.Characteristically, Feynman took an untraditional non-geometric approach to gravitation and general relativity based on the underlying quantum aspects of gravity. Hence, these lectures contain a unique pedagogical account of the development of Einstein's general theory of relativity as the inevitable result of the demand for a self-consistent theory of a massless spin-2 field (the graviton) coupled to the energy-momentum tensor of matter. This approach also demonstrates the intimate and fundamental connection between gauge invariance and the principle of equivalence.

Einstein's gravity theory—his general theory of relativity—has served as the basis for a series of astonishing cosmological discoveries. But what if, nonetheless, Einstein got it wrong? Since the 1930s, physicists have noticed an alarming discrepancy between the universe as we see it and the universe that Einstein's theory of relativity predicts. There just doesn't seem to be enough stuff out there for everything to hang together. Galaxies spin so fast that, based on the amount of visible matter in them, they ought to be flung to pieces, the same way a spinning yo-yo can break its string. Cosmologists tried to solve the problem by positing dark matter—a mysterious, invisible substance that surrounds galaxies, holding the visible matter in place—and particle physicists, attempting to identify the nature of the stuff, have undertaken a slew of experiments to detect it. So far, none have. Now, John W. Moffat, a physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, offers a different solution to the problem. The cap­stone to a storybook career—one that began with a correspondence with Einstein and a conversation with Niels Bohr—Moffat's modified gravity theory, or MOG, can model the movements of the universe without recourse to dark matter, and his work chal­lenging the constancy of the speed of light raises a stark challenge to the usual models of the first half-million years of the universe's existence. This bold new work, presenting the entirety of Moffat's hypothesis to a general readership for the first time, promises to overturn everything we thought we knew about the origins and evolution of the universe.