The three correct answers that provide evidence of universe expansion supporting the Big Bang Theory are:
- Galaxies are moving away from each other.
- An enormous amount of weak cosmic background radiation has been detected in the universe.
- The temperature of Cosmic Microwave Background radiation varies widely from one part of the universe to another.
These observations are key pieces of evidence supporting the theory of the expanding universe and the Big Bang. The movement of galaxies away from each other supports the idea of an expanding universe, the cosmic microwave background radiation is a remnant of the early universe, and its variations provide insights into the conditions of the early universe.