A \_________ is an intermediary between the source masses causing the gravitational forces in a particular region and the gravitational forces themselves
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Definition of a gravitational field
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ellipses
The trajectories of all the planets are \________, with the sun at one focal point.
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radial vector
The \_______ from the sun to a given planet sweeps out equal areas in equal time intervals.
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For circular planetary motion, the centripetal force is provided by the gravitational force
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The following relationship among the velocity, radius, and period of a circular orbit is often useful.
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The equation used to calculate gravitational potential energy for spherical mass distributions is
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When the only force acting on a planet is the gravitational force, the angular momentum is conserved
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