Most of the people have the doubt how did the universe begin...? There are many popular theories regarding the origin of the universe. The most prominent among them is ' the Big Bang ' theory. This theory was first suggested by a Belgian priest named, Georges Lemaitre in the 1920s. Later, the idea got wide acceptance through the studies of Edwin Hubble, Arno Penzias, and Robert Wilson.
The Big Bang theory was born out of the observation that galaxies are moving away from one another at great speed, as if they had been geared by an ancient explosive force. The theory states that some 20 billion years ago, a massive blast -a Big Bang - occurred, and that allowed all the matter in the Universe to spring from some unknown type of energy. After the Big Bang, the universe expanded at a great speed. This expansion still continues, but much more slowly.
But there are many scientists who still doubt the authenticity of Big Bang theory, because it leaves several questions unanswered......
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