20. According to Kepler’s second law, which factor is constant as a line between a planet and the sun sweeps out two equal areas at different places as it moves along its orbit?

Question

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the distance the planet moves
the planet’s speed
the amount of time
the distance from the sun to the planet

Answer 1

The correct answer is the planet's speed. According to Kepler's second law, the line connecting a planet to the sun sweeps out equal areas in equal amounts of time. Since the area of these sectors is determined by the distance the planet moves and the amount of time it takes, the speed of the planet must remain constant.