1) The universe came into existence at a definite moment in time, some 13 billion years ago, in the form of a super hot, superdense fireball of energetic radiation. This is known as the Big Bang theory.
2) In the beginning the universe was so hot all the universal forces (gravitation, electromagnetism, etc.) were one force.
3) The universe was very hot and concentrated in the distant past and, ever since then, space has been stretching and cooling.
4) The Big Bang Theory was actually first theorized by a Catholic priest Georges Lemaître, who founded hubbles law
5) The Big Bang theory is one of the most strongly supported theories in all of science. It explains the observed facts.
6) Astronomers see galaxies moving apart from one another, space in the universe is stretching.
7) All the matter in the universe used to be very close together (very dense) and pushed matter apart.
8) Until the arrival of the Big Bang theory the universe was believed to be essentially eternal and unchanging, represented by the Steady State model.
9) After its initial expansion from a singularity, the Universe cooled sufficiently to allow energy to be converted into various subatomic particles, including protons, neutrons, and electrons.
10) Many people think of the Big Bang as a kind of explosion that happened at some specific point in space, but this isn't correct, as the Universe didn't spring from one central ignition point. Instead, during the Big Bang space was first created and then stretched.
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