space medium True/False

Big Bang Nucleosynthesis produced primarily H, He, and trace Li within first few minutes.

  1. True
  2. False

Answer: True

BBN synthesized ~75% H, ~25% He-4, ppm D/He-3/Li-7; heavier elements formed later in stars/supernovae. Observed abundances validate standard cosmology.

Topic Astronomy - Cosmology
Exam Relevance SSC General Science, UPSC Prelims