Which is evidence of universe expansion that supports the Big Bang Theory?
Choose an answer below.
1. The temperature of the universe has warmed over time.
2. The temperature of the universe has cooled over time.
3. The temperature of the universe is the same as it was at the time of the Big Bang.
4. The temperature of the universe has cooled and warmed repeatedly over time.
2. The temperature of the universe has cooled over time.
According to the Big Bang Theory, the universe originated from a hot, dense state and has been expanding and cooling ever since. The observed cooling of the universe's temperature supports this theory.