Which two energy sources can help a star maintain its internal thermal pressure?
A)nuclear fusion and gravitational contraction
B)nuclear fission and gravitational contraction
C)nuclear fusion and nuclear fission
D)chemical reactions and gravitational contraction
E)nuclear fusion and chemical reactions

Question

Quizplus · Accepted Answer

Nuclear fusion is the process by which atomic nuclei fuse and release energy, thereby releasing heat and radiation energy. This process is the source of energy for stars. Gravitational contraction is the process by which stars shrink to maintain their thermal pressure as they consume their nuclear fuel. Together, these two energy sources help a star maintain its internal thermal pressure. None of the other options listed provide the necessary energy sources required to sustain a star's internal thermal pressure.

Which Two Energy Sources Can Help a Star Maintain Its