Multiple choice general knowledge science & technology

About 74% of the sun's mass is:

  1. Oxygen

  2. Helium

  3. Hydrogen

  4. Carbon

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Sun's composition is primarily hydrogen (about 74% by mass, 92% by volume) with helium making up most of the remainder (about 24-25% by mass). Hydrogen is the fuel for the nuclear fusion reactions that power the Sun. Oxygen and carbon are present only in trace amounts (less than 1% combined).