Why things move -- Restless universe -- From aristotle to galileo -- Laws of motion -- Some concepts in dynamics -- Why things move -- From the falling apple to apollo -- Why did the apple fall? -- What is the law of gravitation? -- Motion of planets -- Newtonian gravity and motion in the solar system -- Who first thought of gravitation? -- Successes of the law of gravitation -- How strong is gravity? -- Mass of the earth -- Mass and weight -- Gravity barriers -- Escape speed -- How strong is gravity? -- Fusion reactors in space -- Fusion -- Genie and the sun -- Kelvin-helmholtz hypothesis -- Sun as a fusion reactor -- Gravity as the controlling agent -- Stellar catastrophes -- Living in curved spacetime -- Is newton's law perfect? -- Strange behavior of mercury -- From newton to einstein -- General theory of relativity -- Non-euclidean geometries -- Do we live in curved spacetime? -- Is time also curved -- Ocean tides and binary stars -- When newton and einstein agree -- Tidal force -- Tides in the oceans -- Experiment of tweddledum and tweedledee -- Tidal disruption -- Gravitational radiation -- Strange world of black holes -- Black hole in history and astronomy -- How are black holes formed? -- Gravitational collapse -- Gravitational redshift -- Event horizon -- Black hole has no hair! -- Spacetime singularity -- Black holes as cosmic energy machines -- Physics of black holes -- Kerr black hole -- Penrose mechanism -- Cygnus x-1 -- Supermassive black holes -- Do black holes exist? -- Expanding universe -- Static universe in newton's theory -- Einstein universe -- Universe is not static -- Big bang -- Is the universe open or closed? -- Was there a big bang? -- Many faces of gravity.