Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A)nuclear fusion and nuclear fission
B)nuclear fusion and supernovae
C)nuclear fission and supernovae
D)nuclear fusion and gravitational contraction

Question

Quizplus · Accepted Answer

Nuclear fusion is the process in which atomic nuclei combine to form heavier elements and release a significant amount of energy, which can help maintain thermal pressure in a star or gas cloud. Gravitational contraction is the process by which the force of gravity causes a cloud of gas to shrink and heat up, also helping to maintain its internal thermal pressure. Nuclear fission involves the splitting of atomic nuclei, which can release energy, but it is not a significant source of energy in stars or gas clouds. Supernovae can release a tremendous amount of energy but they occur only once in a star's lifetime and do not contribute to maintaining its internal thermal pressure.

Which Two Processes Can Generate Energy to Help a Star