How is a main sequence star defined?

Question

Group of answer choices

hydrogen fusion in the core

Hydrogen fusion in shell around contracting core

Double shell burning

Helium fusion in core

Answer 1

The correct answer is "Hydrogen fusion in the core." A main sequence star is defined as a star that is actively fusing hydrogen in its core to release energy. This fusion process is what keeps the star stable and allows it to shine and produce light and heat.