Five proofs the Big Bang happened

• Expansion of the Universe: The most compelling evidence for the Big Bang Theory is the observation that the universe is expanding. This means that in the past, the universe was smaller and denser, and that it has been expanding outward over time.

• Cosmic Background Radiation: The cosmic microwave background radiation (CMB) is a glow of light that is visible in all directions in the universe. This is leftover radiation from the Big Bang and can be used to map out the structure of the universe.

• Abundance of Light Elements: The Big Bang Theory predicts that the early universe was filled with hydrogen and helium. This prediction has been confirmed by observations of the light elements in the universe.

• Redshift of Galaxies: The redshift of galaxies is a measure of how much the light from the galaxies has been stretched by the expansion of the universe. This is strong evidence that the universe is expanding, which is a key prediction of the Big Bang Theory.

• Formation of Structure: The Big Bang Theory also predicts that the universe should have formed structure as it expanded, which has been confirmed by observations of galaxies and other structures in the universe.

Watch my discussion about the claims by Eric Lerner that the big bang never happened:

Errors in "The Big Bang Never Happened!" by Eric Lerner @LPPFusion