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In 1912 a scientist named Vesto Slipher observed the structure of the universe and noticed the galaxies, ("spiral nebula" at the time), were moving away from the earth.
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Scientist, Alexander Friedmann, stated that the universe was expanding which was different then Einsteins theory of his static universe.
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In 1924 Edwin Hubble measured the distance from earth to the nearest "spiral nebula", and confirmed that they were other galaxies.
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In 1931 a man named Georges Lemaitre made a claim that the universe started from one atom.
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A few years after the second world war, the steady state model was made. The idea, made by Fred Hoyle, said that new matter would be formed when the universe expanded.
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On a radio broadcast scientist, Fred Hoyle, gave the theory of the universe a name. He referred to it as,"this big bang idea".
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Discovered in 1964, cosmic microwave background is electromagnetic radiation. This radiation showed evidence of an early stage of the universe. Making the Big Bang theory the most accurate theory for the development of the universe.
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In 1968 and 1970 three scientists, Roger Penrose, Stephen Hawking, and George F. R. Ellis, published papers that said the universe must have started from an infinitely small point.
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From the 70's to the 90's cosmologists, (scientists who study astronomy, and the origin and evolution of the universe), worked on characterizing the features of the Big Bang.
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Alan Guth resolved theories revolving proving rapid expansion in the universe. He called this expansion, "inflation".
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The Cosmic Background Explorer, also known as explorer 66, was used to measure the cosmic background radiation and map its distribution. This helped scientists better map out our universe and figure out the big bang theory.
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In the 1990s new data was found from globular clusters. Globular clusters are stars that orbit a galactic core and are held together by gravity. The data found in the 90's showed that the clusters were 15 billion years old.
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In the late 90's there were advances to telescope technology to accurately and precisely get data from the big bang model.
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The Hubble Telescope was an electronic device that was designed to gather light from cosmic objects to better understand the universe and gather more data concerning the big bang.
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As stated in the last timeline point, the globular clusters proved the universe to be 15 billion years old which was not accurate for the current estimates. With newer advances in technology in the 90's this issue was fixed and we got a more accurate age of the universe.
