Question:What evidence is there in support of the Big Bang Theory?
The main evidence for the Big Bang Theory are:
1: The Stellar Red Shift
2: The Cosmic Microwave Background Radiation
The stellar red shift provides evidence that the universe is still expanding because it shows that all the stars are moving away from each other and that the farthest away stars are moving away the fastest.
The cosmic microwave background radiation provides evidence for the universe once being very hot.