How do large mass stars in the upper region of the main sequence produce energy?
A) by fusing hydrogen using the proton-proton chain
B) by fusing hydrogen using the CNO Cycle (carbon-nitrogen-oxygen)
C) by fusing hydrogen using both the CNO Cycle and the proton-proton chain
D) by fusing hydrogen using the HNO Cycle (hydrogen-nitrogen-oxygen)
E) by fusing helium using the HeNO Cycle (helium-nitrogen-oxygen)

Question

Quizplus · Accepted Answer

Large mass stars in the upper region of the main sequence primarily produce energy by fusing hydrogen using the CNO Cycle (carbon-nitrogen-oxygen), as this process is more temperature-sensitive and dominates in the hotter cores of massive stars.

How Do Large Mass Stars in the Upper Region of the Main