Question

which is evidence of universe expansion that supports the big bang theory?
a. the temperature of the universe has cooled and warmed repeatedly over time
b. the temperature of the universe has warmed over time
c. the temperature of the universe has cooled over time
d. the temperature of the universe is the same as it was at the time of the big bang

Answers

GPT-4o mini
The correct answer is:

**c. the temperature of the universe has cooled over time.**

This evidence supports the Big Bang theory because it suggests that the universe has been expanding since its inception. As the universe expands, the temperature decreases, which is consistent with observations of the cosmic microwave background radiation and other measurements of the universe's temperature over time.