What does a protoplanetary disk most likely have in common with Earth's Solar System?
A.
They both have well-defined planets that orbit due to gravity.
B.
They both decrease in gravity as they accumulate more mass.
C.
They both are in motion and are held together by gravity.
D.
They both have planets that have formed without gravity.
1 answer
The correct answer is:
C. They both are in motion and are held together by gravity.
A protoplanetary disk is in the process of forming planets, and the material within the disk is influenced by gravitational forces, similar to how the planets in Earth's Solar System are held in orbit around the Sun by gravity.
