Multiple choice general knowledge science & technology

A star is a luminous ball of gas composed mainly of what

  1. Oxygen & Hydrogen

  2. Helium & Oxygen

  3. Krypton & Helium

  4. Hydrogen & Helium

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

Stars are primarily composed of hydrogen (about 74% by mass) and helium (about 24%) through nuclear fusion. While oxygen exists in stars, it's not one of the two primary components.