What Do We Mean by the Orbital Energy of an Orbiting

Multiple Choice

What do we mean by the orbital energy of an orbiting object (such as a planet, moon, or satellite) ?

A) Orbital energy is the sum of the object's kinetic energy and its gravitational potential energy as it moves through its orbit.
B) Orbital energy is the object's kinetic energy as it moves through its orbit.
C) Orbital energy is the amount of energy required for the object to leave orbit and escape into space.
D) Orbital energy is a measure of the object's speed as it moves through its orbit.