Discussion
The line that joins any planet to the sun sweeps out equal areas in equal intervals of time. This statement is
Answer: D
The statement is Kepler's second law, the law of areas.
Kepler's second law says that the line joining a planet to the Sun sweeps out equal areas in equal intervals of time. It means a planet moves faster when it is near the Sun and slower when it is far away, and it follows from the conservation of the planet's angular momentum about the Sun.
Kepler's first law is the law of orbits: each planet moves in an ellipse with the Sun at one focus. The law of periods is his third law, T2 proportional to a3. Newton's law of gravitation gives the force between masses, and Newton's third law concerns action and reaction.
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