The Big Bang Theory
This theory was first proposed in 1931 by Georges Lemaitre. According to this theory, the universe started off in a state of extreme heat and density and then expanded with great speed. It was not in the literal sense a 'bang' at all, it was just a rapid expansion. The expansion resulted in the Universe cooling into its state that it is in today, which is still expanding. This theory is more believable than others that have been proposed as there is evidence of it. It was found that galaxies surrounding us were moving away from us at a rapid speed. This means that the universe is expanding. One of the first people to support this theory was Edwin Hubble.
Discovered in 1912 by Vesto Slipher, red shift is a significant factor contributing to the credibility of this theory. It was found that the wavelength of the light that most stars give off has moved to the end of the spectrum that is red. It is known by astronomers that when stars are moving away from Earth at a fast pace, a red shift occurs. Many people consider this valid evidence that our universe is constantly expanding.
Another piece of information that adds credibility to the theory is the existence of Cosmic Microwave Background Radiation (CMBR). It is a faint radiation that fills all space. Arno Penzias and Robert Wilson accidentally discovered it in 1965. While trying to overcome the noise they were getting when working with a microwave receiver, they realised what they were hearing. The noise was of the same frequency every way they pointed the receiver. A Nobel Prize was later shared between the two men for their discovery.
Also considered to prove the Big Bang theory is that gases such as hydrogen, helium and lithium exist. For these gases to exist today, there must have been some kind of explosion, such as the Big Bang.
Discovered in 1912 by Vesto Slipher, red shift is a significant factor contributing to the credibility of this theory. It was found that the wavelength of the light that most stars give off has moved to the end of the spectrum that is red. It is known by astronomers that when stars are moving away from Earth at a fast pace, a red shift occurs. Many people consider this valid evidence that our universe is constantly expanding.
Another piece of information that adds credibility to the theory is the existence of Cosmic Microwave Background Radiation (CMBR). It is a faint radiation that fills all space. Arno Penzias and Robert Wilson accidentally discovered it in 1965. While trying to overcome the noise they were getting when working with a microwave receiver, they realised what they were hearing. The noise was of the same frequency every way they pointed the receiver. A Nobel Prize was later shared between the two men for their discovery.
Also considered to prove the Big Bang theory is that gases such as hydrogen, helium and lithium exist. For these gases to exist today, there must have been some kind of explosion, such as the Big Bang.