Which statements describe the motion of a planet according to Kepler’s second law? Check all that apply. 1. The speed of a planet varies as it moves in its orbit.
2. The speed of a planet is constant as it moves in its orbit.
3. A planet travels the same distance along its orbit in equal units of time.
4. A planet sweeps out an equal area in equal units of time.
5. A planet’s orbit is a circle centered on the Sun.
6. A planet’s orbit is an ellipse with the Sun at one focus.