Question

scientists who proposed the big bang theory were attempting to explain...
a. the origin of the universe.
b. why stars have different luminosities.
c. the formation of our solar system.
d. how earths atmosphere evolved.

Explanation:

The Big Bang Theory is a scientific model that describes the early development of the universe and aims to explain its origin. It is not related to star luminosities, solar - system formation, or Earth's atmosphere evolution.

Answer:

A. the origin of the universe