Comparing cooling temperatures changes at different stages of the universe’s life provides evidence of ____. Measuring the universe’s ratio of hydrogen and helium provides evidence that these elements ____.

Answer 1

Comparing cooling temperature changes at different stages of the universe's life provides evidence of cosmic expansion. As the universe expands, the average temperature of cosmic microwave background radiation decreases. By studying the changes in this temperature over time, scientists can gather evidence for the expansion of the universe.

Measuring the universe's ratio of hydrogen and helium provides evidence that these elements were formed during the Big Bang. The Big Bang theory suggests that the universe began as an extremely hot, dense state and then rapidly expanded. During this expansion, hydrogen and helium atoms were created. By studying the abundance of these elements in the universe, scientists can gather evidence supporting the Big Bang theory.