Images source: NASA, Shutterstock (Representative images)
The Big Bang is where our universe started- around 13.8 billion years ago. According to NASA, the Big Bang is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now- and is still growing.
The Big Bang theory was proposed by Georges Lemaître- a Belgian astronomer. Lemaître said that a very long time ago, the universe started as just a single point. He said the universe stretched and expanded to get as big as it is now, and that it could keep on stretching.
What happened before the Big Bang has been a mystery which remains unanswered to this day. The question has boggled scientists for years. Perhaps there was nothing!
Will Kinney, a physicist at the University of Buffalo, said in his book (An Infinity of Worlds: Cosmic Inflation and the Beginning of the Universe) that before the Big Bang, the universe underwent a breathtaking cosmic expansion, doubling in size at least 80 times in a fraction of a second. Kinney said that this rapid inflation fueled by a mysterious form of energy that permeated empty space itself, left the universe desolate and cold. Only after this, did the conditions of the Big Bang emerge.