How exactly was the universe created? Well, the answer is, we do not know an exact answer. But most astronomers now believe that the universe was created by the Big Bang. The Big Band theory was proposed by and astronomer known as Georges Lemaître.
Astronomers still do not know when this occurred. But astronomers have assumed that it occurred 13.8 billion years ago. The Big Bang Theory states that all matter in the universe began as a hot, dense and minute speck. This speck expanded and cooled down and the elements, stars, planets, galaxies and every other thing in the universe was created. The first elements in the universe were hydrogen and helium. Then eventually stars, galaxies, planets and other elements were created.
You might wonder where this Big Bang occurred? Well, there's no place where it occurred because, before the Big Bang length, width, height or the fourth dimension of time didn't exist. It sounds very interesting, isn't it? It was the Big Bang which brought space and time into life. Our universe is still expanding as it was before, so the galaxies and everything in it are moving further and further away from us.
In 1964, Arno Penzias and Robert Wilson discovered the cosmic microwave banckground radiation. It means, they discovered the whole universe was radiating microwaves. As the explosion of the Big Bang cooled down, these microwaves were left behind.
The Steady State Theory is the alternative for the Big Bang Theory. It says that the universe had no beginning or end, and it was ever expanding. Only few astronomers now believe in this theory.
So, if that's how the universe started, how will it end? Or will the universe actually end? There are also many theories proposed for this question.
The universe will stop its expansion if there's enough matter in the universe. The combined gravity of all those matter will halt the expansion and destroy everything in. This is known as the "Big Crunch". The Big Crunch sounds a bit thrilling and it will occur billions of years from now. But the alternative of this isn't much exciting and sounds a bit "dull". The stars in the universe will consume the hydrogen in the cosmos and eventually no new stars will be able to form and there will only be dead stars, black holes in a lifeless universe.
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| The Big Bang |
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| Georges Lemaitre |
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