Question

which is the evidence of the universe expansion that supports the big bang Theory? the temperature of the universe has cooled over time
the temperature of the universe is the same as it was at the time of the big bang
the temperature of the universe has cooled and warmed repeatedly over time
the temperature has warmed over time

Answer 1

The evidence of the universe expansion that supports the Big Bang Theory is the cooling of the universe over time. According to the theory, the universe initially started as a hot and dense state during the Big Bang and has been expanding ever since. As the universe expands, the energy and temperature of the universe decrease. This cooling effect is observed as the cosmic microwave background radiation, which is considered one of the key pieces of evidence for the Big Bang Theory.