The Big Bang theory was developed from observations of the structure of the universe. Some of the men to discover it were Vesto Slipher, Alexander Friedmann, Georges Lemaître, and Edwin Hubble along with many others. Many scientist have developed ways to understand the theory more, an example to this would be the WMAP satellite, which gathers data to help scientists understand the Big Bang. Huge strides in Big Bang cosmology have been made since the late 1990s, scientists now have a much better understanding then of how they thought of it back then.
According to the Big Bang Theory, the universe was formed approximately 13,700,000,000 years ago. This theory suggests that the Big Bang created space, time and all matter inside our universe. Supposedly, hydrogen and helium released from the Big Bang fused to form heaver, newer atoms. At one point, our universe was a dot no larger than a billionth, of a billionth, of a billionth, of a billionth, of a billionth of a meter in diameter). That's a one followed by forty-five zeros! Of course, this is just a theory, and that doesn't actually mean this happened.
Many people fall under the false assumption that the Big Bang was an immense explosion. That is not true. It was actually just a fast expansion of space time. A protostar is a dense clump of matter in center of nebula. At first – in the protostar – heat was due to friction, but when the protostar reached 18,000,000 degrees Fahrenheit, nuclear fusion took place and replaced the source of heat.
In 1927, a Belgian priest named Georges Lemaître – mentioned earlier – was the first to say that the universe began with the explosion of a primeval atom, or better known as the "BIG BANG". His proposal came after observing the red shift in distant nebulas by astronomers to a model of the universe based on relativity. A couple of years later, Edwin Hubble found experimental evidence to help prove or justify George's theory.
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