Multiple choice

Which among the following is not considered to be natural source of light?

  1. Stars

  2. Nebula

  3. Galaxy

  4. Fire

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

Stars, nebulae, and galaxies are natural celestial sources of light. Fire is a chemical combustion process and while it produces light and heat, it is not a natural astronomical source of light like celestial objects.