Today, scientists have reached a consensus that the universe came into being out of nothing—suddenly, with a great explosion called the Big Bang. Compelling evidence which caused the Big Bang Theory to be inevitably accepted is as follows:
Expansion of the universe: In 1929, Edwin Hubble discovered that all heavenly objects move away from each other, which is evidence that the universe constantly expands. This is conclusive proof that the universe came into being by the explosion of a single point (the Big Bang).
Cosmic Background Radiation: Since the universe emerged as a result of an explosion, there had to be some radiation left over from this explosion and this radiation should have pervaded the entire universe uniformly. Unsurprisingly, this radiation was found in 1965. Subsequently its existence was conclusively confirmed with the help of satellites.
The hydrogen-helium ratio in the universe: Another significant place of evidence for the Big Bang is the amount of hydrogen and helium gases in space. In the latest calculations, it was understood that the hydrogen-helium concentration in the universe complied with the theoretical calculations of the hydrogen-helium concentration remaining from the Big Bang. If the universe had no beginning and if it had existed forever, its hydrogen constituent should have been completely consumed and converted to helium.
The Big Bang Theory, which implies that the universe came into being out of nothing, meaning that it was created, ultimately destroyed the claim of the materialist philosophy that the universe had always existed and would always exist.