What Proves the Big Bang Theory?

Three key pieces of observational evidence lend support to the Big Bang theory: the measured abundances of elements, the observed expansion of space, and the discovery of the cosmic microwave background (CMB). The CMB refers to the uniform distribution of radiation that pervades the entire universe.

What are 3 forms of evidence for the Big Bang?

Three main pieces of evidence for the Big Bang theory are the red-shift of light, cosmic background radiation and types of elements.

Has the Big Bang theory been proven?

A theory can never be proven, but must be "testable" through observation or experimentation. Thus far, despite some notable problems, the Big Bang Theory has remained largely consistent with the observations and is widely accepted through the cosmological community.