Three pieces of evidence of universe expansion support the Big Bang Theory. The first piece of evidence, which Edwin Hubble discovered, is that ______. The second piece of evidence is the change in universal temperature. The temperature ________. The third piece of evidence is that Cosmic Microwave Background radiation is found ________

Answer 1

The first piece of evidence, which Edwin Hubble discovered, is that galaxies appear to be moving away from each other. This observation, known as Hubble's Law, suggests that the universe is expanding.

The second piece of evidence is the change in universal temperature. Scientists have found that the universe is cooler today than it was in the past. This supports the idea of an expanding universe, as the cooling would be a result of the universe stretching out.

The third piece of evidence is that Cosmic Microwave Background radiation is found throughout the universe. This radiation is believed to be remnants of the intense energy released during the Big Bang. Its presence and homogeneous distribution provide strong support for the idea of an initial explosion that led to the expansion of the universe.