Theories
There are many different theories of how the universe was created. The main theories of the origin are the Big Bang theory, Steady State theory and Multiverse. All the different theories all explain how the universe was created and how we came to be. Scientist believe that the universe is still expanding and the existence of heat radiation that is the suspected "afterglow" of the Big Bang. Stephan Hawking came up with the big bang theory and believes that the universe was created 12 billion years ago! The steady state was first thought of by Sir James Jeans in the 1920's, it was further developed by Sir Fred Hoyle to deal with the problems with the connection of the alternative big bang theory thought.
Big Bang
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This theory is that the universe was created by a gigantic explosion of a central large and dense mass. Elements were formed during the explosion such as helium and hydrogen. Heavier elements we formed later in the nuclear fusion process of the stars. It is to be thought of that the explosion was an unfolding of the universe, it was hot and was silent. This theory was created by Stephan Hawking. According to the standard theory, our universe sprang into existence as "singularity" around 13.7 billion years ago. After its initial appearance, it apparently inflated the big bang, expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. It continues to expand and cool to this day and we are inside of it, incredible creatures living on a unique planet, circling a beautiful star clustered together with several hundred billion other stars in a galaxy soaring through the cosmos, all of which is inside of an expanding universe that began as an infinitesimal singularity which appeared out of nowhere for reasons unknown. This is the Big Bang theory.
Steady State
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The steady-state theory is a view that the universe is always expanding but maintaining a constant average density. There are constantly new stars and galaxies being created. A steady-state universe has no beginning or end in time and from any point within it the view on the grand scale, the average density and arrangement of galaxies is the same. Galaxies of all possible ages are intermingled.
Multi verse
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The Multiverse theory for the universe has been a recently accepted theory that describes the continuous formation of universes through the collapse of giant stars and the formation of black holes. With each of these black holes there is a new point of singularity and a new possible universe. As Rees describes it, "Our universe may be just one element one atom, as it were, in an infinite ensemble: a cosmic archipelago. Each universe starts with its own big bang, acquires a distinctive imprint (and its individual physical laws) as it cools, and traces out its own cosmic cycle. The big bang that triggered our entire universe is, in this grander perspective, an infinitesimal part of an elaborate structure that extends far beyond the range of any telescopes." This puts our place in the Multiverse into a small spectrum. While the size of the earth in relation to the sun is minuscule, the size of the sun, the solar system, the galaxy, and even the universe, could pale in comparison to this proposed Multiverse. It would be a shift in thinking that may help explain our big bang theory and possibly give light to the idea of parallel universes.