What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's apparent backward movement is termed retrograde motion. D. An object's orbital period is related to its distance from the object it orbits.

Kepler's second law of planetary motion says that the imaginary line

from the Sun to the planet sweeps out equal areas in equal periods

of time.

It's just as true of comets, asteroids, dwarfs, coasting space probes ...

anything in the solar system that's coasting in gravity, and not firing engines.

That's why a comet moves so fast when it gets near the Sun.