1. Which is evidence of universe expansion that supports the Big Bang Theory?
a. the temperature of the universe is the same as it was at the time of the Big Bang.
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 has cooled and warmed repeatedly over time.
c. the temperature of the universe has cooled over time.
c. the temperature of the universe has cooled over time.
To determine which option is evidence of universe expansion that supports the Big Bang Theory, we need to consider the concept of the cosmic microwave background radiation (CMB). The CMB is residual radiation left over from the early stages of the universe and is considered a crucial piece of evidence for the Big Bang Theory.
The correct answer is c. the temperature of the universe has cooled over time. This is because as the universe expands, the wavelengths of the CMB photons also stretch, causing a decrease in their energy. As a result, the temperature of the universe decreases. This cooling effect is one of the key observational pieces of evidence for the expansion of the universe, supporting the idea of the Big Bang.
To arrive at this answer, it is important to be familiar with the concept of cosmic microwave background radiation and its significance to the Big Bang Theory. Additionally, understanding the relationship between the expansion of the universe and the change in temperature is crucial in deducing the correct option.