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The Concept Map you are trying to access has information related to:
gravity, planetary orbits, distance , concepts, gravity, all objects accelerate equally independent of mass, elliptical, tycho brahe 1546 - 1601, johannes kepler 1571 - 1630, motions of planets, circular, between any two objects there is an attractive force proportional to the product of the two masses divided by the square of the distance between them, time to travel various distances, astronomers, distance travelled with time, father of experimental science, newton's law of universal gravitation, galileo galilei 1564 - 1642, balls rolling down inclined planes, square of time, laws of planetary motion