Big Bang Theory
There are perhaps few people who have not heard of the Big Bang theory, the scientific model that describes the initial genesis of the universe. Have a custom research paper written on the Big Bang Theory by the writers at Paper Masters.
According to the Big Bang Theory, there was massive explosion 13.8 billion years ago, with the universe expanding and cooling from that point to its present state. Scientist Georges Lemaitre first proposed in 1927 that an expanding universe could be traced back to an original starting point, the first notion of the Big Bang theory.
Facts About Big Bang Theory
- American astronomer Edwin Hubble was the first to discover that the universe was expanding, in 1929.
- In 1964, the discovery of cosmic microwave background radiation proved the fact of the expanding universe, giving weight to the Big Bang theory.
- Scientists do know that the universe began to expand exponentially with seconds. As it expanded, it decreased in density and temperature.
- Atomic nuclei formed within three minutes, but thousands of years passed before there were electrically neutral atoms.
- In reality, the actual state of the universe at the moment of the Big Bang remains unknown.
British astronomer Fred Hoyle is credited with coining the term "Big Bang" in 1949. Outside of scientific circles, the idea of the Big Bang theory raises philosophical questions, specifically whether the scientific fact of the universe's origin supports or refutes the idea of a Creator. Regardless, the universe is in no danger of collapsing for billions more years.
the existence of galaxies, as well as other discrete structures, has posed something of a problem for the cosmological theory known as the Big Bang. The so-called Hot Big Bang Theory, as Liddle notes, requires that the universe, taken as a whole, be both homogeneous, i.e. that it look the same everywhere, and isotropic, i.e. that it appear to be the same in all directions that we can look. Neither of these characterizes the "nearby" universe which, in place of a smoothly distributed fluid, contains "lumps" in the form of planets, stars and galaxies. The largest of these entities-and those which contain most of the stars and most of the planets in the observable universe-are galaxies, and they themselves are not distributed uniformly. Rather, they "show strong clustering with the galaxies lining up in filaments and walls". Because galaxies are "clumped", there are also vast regions of space in which there are no galaxies at all. Lightman notes that in 1981 a group of researchers found a large "void" in space-about 100 million light years in diameter--in which there are few galaxies to be found. The Coma Supercluster, which contains about 10,000 galaxies, is surrounded by relatively empty space. Friedman notes that there is evidence of voids that may be as large as 250 million light years in diameter, that such a void could contain a billion galaxies the size of the Milky Way, that some voids seem to contain no galaxies at all, and that it is thought by some that vast galaxies of "dark matter" may be present in some of the seemingly empty spaces of the universe.