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