## The attractive universe: gravity and the shape of spaceExplores the laws of gravity on earth and in space as viewed by scientists from Aristotle to Einstein. |

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acceleration of gravity altitude angular momentum apocenter apogee asteroid astronomer ATTRACTIVE UNIVERSE ball Brahe brake center of mass centrifugal force circling the Earth circular orbit circular velocity comet curve diagram direction distance drop Earth's surface eastward eighty-four minutes Einstein elevator ellipse elliptical orbit elliptical path equator Eros escape velocity faster feet per second focus force of gravity four G-WHIZ Galileo gravitational attraction gravitational field gravitational mass horizontal inertial mass inside Jupiter Kepler Kepler's third law kinetic energy launch lunar tides Mars massive measuring miles per hour miles per second Moon Moon's motion moving Newton North Pole object parabolic velocity particles pendulum bob pendulum car perigee perihelion period planet quarter-second radius relative revolving Robert Hooke roll rotation satellite satellite's Shape of Space sling speed sphere spin square star stone straight line string Sun's swing thing thousand miles tidal bulges tidal forces track travels tunnel twice weight weightless