Planets and other celestial bodies move in orbits around larger astronomical objects.
State the name of the attractive force that acts as the centripetal force keeping planets and moons in stable circular orbits.
The diagram below represents a hierarchical orbital system within our galaxy.
Classify the astronomical bodies labeled (1), (2), and (3) using only terms from the following list: Moon, Planet, Star.
Compare the orbital period (time taken for one complete orbit) of body (3) around body (2) to the orbital period of body (2) around body (1). Explain the main physical reason for this difference.
