# A satellite orbits Earth once per day. From the reference frame of the Moon, which orbits Earth...

## Question:

A satellite orbits Earth once per day. From the reference frame of the Moon, which orbits Earth once about every 27 days, what is its motion?

A.The satellite never moves relative to the moon

B.The satellite travels continuously away from the moon.

C. The satellite remains at a constant distance from the moon.

D.The satellite continuously move closer and farther away from the mood.

## Orbit

A mass is said to be in orbit around a larger mass when it continuously circles around the larger mass, held in place by the gravitational attraction between the two bodies.

Begin at a time when the moon and the satellite are over nearly the same spot on the ground, this is also the satellite's closest approach to the moon. As the day progresses, the satellite continues in its faster orbit, which from the frame of the moon, appears to be moving away. When the satellite is exactly opposite the moon's orbit, this is the furthest away it will be. After that, the satellite comes around Earth and catches up to the moon. From the moon's frame, the satellite is now moving closer. This cycle repeats when the satellite passes the moon.

D. The satellite continuously moves closer and farther away from the moon.