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 a measure of the object's speed as it moves through its orbit.
D) Orbital energy is the amount of energy required for the object to leave orbit and escape into space.
Question 2
Stellar parallax provides concrete proof that the
A) Earth rotates on its axis
B) Earth is roughly spherical
C) Earth moves around the Sun
D) Moon moves around the Earth
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