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Assessment
What is the first of Kepler's laws of planetary motion?
Planets move in elliptical orbits with the Sun at one focus.
The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
All planets revolve around the Sun in circular orbits.
According to Kepler's Second Law, what happens to a planet's speed as it approaches the Sun?
The planet moves slower.
The planet moves faster.
The planet maintains a constant speed.
The planet stops temporarily.
What does Kepler's Third Law relate?
The periods of revolution of planets to their distances from the Sun.
The mass of the planets to the distance from the Sun.
The shapes of the orbits to the speed of the planets.
The temperature of planets to their distance from the Sun.
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