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The Big Bang theory is the prevailing cosmological model for the earliest known periods of the universe and its subsequent large-scale evolution. It states that the Universe was in a very high density state and then expanded. If the known laws of physics are extrapolated beyond where they are valid there is a singularity. Modern measurements place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the Universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies. The Big Bang theory does not provide any explanation for the initial conditions of the Universe; rather, it describes and explains the general evolution of the Universe going forward from that point on.

Since Georges Lemaître first noted, in 1927, that an expanding universe might be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, accumulated empirical evidence provides strong support for the former. In 1929, Edwin Hubble discovered indications that all galaxies are drifting apart at high speeds. In 1964, the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model, since that theory predicted the existence of background radiation throughout the Universe before it was discovered. The known physical laws of nature can be used to calculate the characteristics of the Universe in detail back in time to an initial state of extreme density and temperature....
 
 
The Big Bang theory is the prevailing cosmological model for the earliest known periods of the universe and its subsequent large-scale evolution. It states that the Universe was in a very high density state and then expanded. If the known laws of physics are extrapolated beyond where they are valid there is a singularity. Modern measurements place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the Universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies. The Big Bang theory does not provide any explanation for the initial conditions of the Universe; rather, it describes and explains the general evolution of the Universe going forward from that point on.

Since Georges Lemaître first noted, in 1927, that an expanding universe might be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, accumulated empirical evidence provides strong support for the former. In 1929, Edwin Hubble discovered indications that all galaxies are drifting apart at high speeds. In 1964, the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model, since that theory predicted the existence of background radiation throughout the Universe before it was discovered. The known physical laws of nature can be used to calculate the characteristics of the Universe in detail back in time to an initial state of extreme density and temperature.... More • http://en.wikipedia. ... i/Big_Bang View • BooksImagesVideosSearch Related • PeriodsBig BangAll Events

 
    The Universe
  The Universe
The Universe is all of time and space and its contents. The Universe includes planets, stars, galaxies, the contents of intergalactic space, the smallest subatomic particles, and all matter and energy. The majority of matter and energy is most likely...
 
    FORMATION OF EARTH
  FORMATION OF EARTH
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world, the Blue Planet, or b...
 
    Earth, 3rd Planet from the Sun
  Earth, 3rd Planet from the Sun
Earth is the third planet from the Sun. It is the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world or the Blue Planet....
 
    The Nine Planets
  The Nine Planets
The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system. Each page has my text and NASA's images, some have sounds and movies, most provide references to addit...
 
    Uranus, 7th Planet from the Sun
  Uranus, 7th Planet from the Sun
Uranus is the 7th planet from the Sun. It was discovered in 1781 by William Herschel and named for the Greek god personifying heaven. A blue-green gas giant, it has almost 15 times the mass of Earth and over 50 times its volume. It is less dense than...
 
    Neptune, 8th Planet from the Sun
  Neptune, 8th Planet from the Sun
Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus. In Roman mythology Neptune (Greek: Poseidon) was the god of the Sea. After the discovery of Uranus,...
 
    The Sun, Center of our Solar System
  The Sun, Center of our Solar System
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Ear...
 
    Copernicus, Earth moves around the Sun
  Copernicus, Earth moves around the Sun
Nicolaus Copernicus was a Renaissance- and Reformation-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe, likely independently of Aristarchus of Samos, who...
 
    Galileo Galilei, Father of Modern Science
  Galileo Galilei, Father of Modern Science
Galileo Galilei was an Italian polymath: astronomer, physicist, engineer, philosopher, and mathematician. He has been called the "father of observational astronomy", the "father of modern physics", the "father of the scientific method", and the "fath...
 
    Isaac Newton, Theory of Gravitation
  Isaac Newton, Theory of Gravitation
Sir Isaac Newton was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolutio...
 
    William Herschel, Discovered Uranus - 1781
  William Herschel, Discovered Uranus - 1781
Sir Frederick William Herschel was a German-born British astronomer and composer who became famous for discovering Uranus. He also discovered infrared radiation and made many other discoveries in astronomy. He played the cello besides the oboe and...
 
    Albert Einstein, Relativity Theory - 1905
  Albert Einstein, Relativity Theory - 1905
Albert Einstein was a German-born theoretical physicist. Einstein developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). Einstein's work is also known for its influence on the philosophy of science...
 
    Edwin Hubble, Big Bang Theory
  Edwin Hubble, Big Bang Theory
Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Hubble is known for s...
 
    Lemaître, Proposed Big Bang Theory
  Lemaître, Proposed Big Bang Theory
Georges Lemaître was a Belgian Roman Catholic priest, honorary prelate, professor of physics and astronomer at the Catholic University of Leuven. He sometimes used the title Abbé or Monseigneur. Lemaître proposed what became known as the Big Bang the...
 
    Gerard Kuiper, Prediction of the Kuiper Belt
  Gerard Kuiper, Prediction of the Kuiper Belt
Kuiper is considered to be the father of modern planetary science for his wide ranging studies of the solar system. Although he contributed to astrophysics, established the atmosphere of Saturn's moon Titan, and discovered Saturn's moon Miranda and N...
 
       
         
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