the moon orbits our earth. the opposite would never be true: the earth would never orbit the moon. one reason is due to the force of gravity. the object has a greater gravitaional force and that determines what satelites orbit around it.

The moon keeps the same face pointing towards the Earth because its rate of spin is tidally locked so that it is synchronized with its rate of revolution (the time needed to complete one orbit). In other words, the moon rotates exactly once every time it circles the Earth.

e/c, where e is its total energy

+15-35=-20

going in opposite directions