Just like the Theory of Gravity no one has yet been able to prove that the universe was formed by the Big Bang. But scientists do have 4 main points that support the Big Bang Theory.
1. Galaxies are moving away from each other, the universe is expanding.
2. The universe is "bathed" in microwave radiation that is left over from a huge explosion.
3. The universe is abundant in hydrogen and helium.
4. We have found no stars older than 13.7 billion years.
