When is/was gravitational contraction an important energy generation mechanism for the Sun?
A)It was important when the Sun was forming from a shrinking interstellar cloud of gas.
B)It is the primary energy generation mechanism in the Sun today.
C)It has played a role throughout the Sun's history,but it was most important right after nuclear fusion began in the Sun's core.
D)It is important during periods when the Sun is going from solar maximum to solar minimum.

Question

Quizplus · Accepted Answer

Gravitational contraction was an important energy generation mechanism for the Sun when it was forming from a shrinking interstellar cloud of gas. Once nuclear fusion began in the Sun's core, it became the primary energy generation mechanism.

When Is/was Gravitational Contraction an Important Energy Generation Mechanism for the Sun