What physical process is taking place inside a star that is in the main-sequence phase of its life?
A) Hydrogen is being converted to helium in its core.
B) Hydrogen is being converted to helium in a shell around a core where no nuclear reactions are occurring.
C) The gas in the star is contracting gravitationally without nuclear reactions taking place.
D) Helium is being converted to carbon in its core.

Question

Quizplus · Accepted Answer

During the main sequence phase of a star's life, it is primarily fueled by the nuclear fusion of hydrogen into helium in its core. This process releases large amounts of energy, which causes the star to emit light and heat. As long as the star has enough hydrogen to fuse, it will remain in the main sequence phase.

What Physical Process Is Taking Place Inside a Star That