THE TRIUMPH OF THE BIG-BANG

In 1948, George Gamov carried George Lemaitre's calculations several steps further and came up with a new idea concerning the Big Bang. If the universe was formed in a sudden, cataclysmic explosion, there ought to be a definite amount of radiation left over from that explosion. This radiation should be detectable and, furthermore, it should be uniform throughout the universe. 

Within two decades, observational proof of Gamov's conjecture was forthcoming. In 1965, two researchers by the name of Arno Penzias and Robert Wilson chanced upon a form of radiation hitherto unnoticed. Called "cosmic background radiation", it was unlike anything coming from anywhere else in the universe for it was extraordinarily uniform. It was neither localized nor did it have a definite source; instead, it was distributed equally everywhere. It was soon realized that this radiation was the echo of the Big Bang, still reverberating since the first moments of that great explosion. Gamov had been spot-on for the frequency of the radiation was nearly the same value that scientists had predicted it would be. Penzias and Wilson were awarded a Nobel prize for their discovery.

In 1989, George Smoot and his NASA team sent a satellite into space. Called the "Cosmic Background Emission Explorer" (COBE), it took only eight minutes for the sensitive instruments on board the satellite to detect and confirm  the levels of radiation reported by Penzias and Wilson. These results conclusively demonstrated the existence of the hot, dense form remaining from the explosion out of which the universe came into being. Most scientists acknowledged that COBE had successfully captured the remnants of the Big Bang.

More evidence for the Big Bang was forthcoming. One piece had to do with the relative amounts of hydrogen and helium in the universe. Observations indicated that the mix of these two elements in the universe was in accord with theoretical calculations of what should have been remained after the Big Bang. That drove another stake into the heart of the steady state theory because if the universe had existed for eternity and never had a beginning, all of its hydrogen should have been burned into helium.

Confronted by such evidence, the Big Bang gained the near-complete approval of the scientific world. In an article in its October 1994 issue, Scientific American noted that the Big Bang model was the only one that could account for the constant expansion of the universe and for other observational results.

Defending the Steady-State theory along with Fred Hoyle, Dennis Sciama describes their predicament in the face of the evidence for the Big Bang saying that he had first taken a stand along with Hoyle but, as evidence began to pile up, he had to admit that the game was over and that the steady-state theory had to be dismissed.1

Sir Arthur Eddington's statement that "the notion of an abrupt beginning to the present order of nature was repugnant to him" was an admission of the discomfort that the Big Bang caused for materialists

The cosmic background radiation discovered by Penzias and Wilson is regarded as incontrovertible evidence of the Big Bang by the scientific world.

Notes

1. Stephen Hawking, Evreni Kucaklayan Karinca, Alkim Publishing, 1993, p. 62-63