space medium MCQ

Main sequence stars generate energy primarily through which process?

  1. Nuclear fission
  2. Hydrogen fusion
  3. Helium fusion
  4. Carbon burning

Answer: Hydrogen fusion

Main sequence stars fuse hydrogen into helium in their cores via the proton-proton chain or CNO cycle, releasing energy that counteracts gravitational collapse.

Topic Astronomy - Stars
Exam Relevance SSC CGL, UPSC Prelims