Who gave Big Bang theory? | What was the earlier theory and how did ‘Big Bang’ theory proved?
Many theories were given by many scientists on the universe. The Greek scientist Aristotle gave the theory saying that the universe was constant and it was not born. In 20th century, a scientist named Hermann Bondi gave the steady state theory which supports the Aristotle theory. The stars, planets and other heavenly bodies were born but the universe was constant. The matter in the universe will be born but the universe will be constant.
In 1927, when all the scientists believed Hermann theory, a new scientist gave the big bang theory of universe. The person who gave big bang theory was Georges Lemaitre and his theory tells that the universe was formed by the explosion of a big particle and the universe is expanding. Lemaitre was born in Charleroi in 1894 on July 17th. He had two goals for him which were, taking PhD in mathematics and to become a religion head. He had showed interest in the astronomy and he observed that the universe expands with the theory of relativity given by Einstein. At first, he agreed with the steady state theory and introduced a cosmological constant and said that the universe was constant.
When he was doing research on the Einstein theory, he came to know that the universe is expanding and not constant one. He then gave the big bang theory and at first no one cared about and neglected. After two years when Edwin Hubble prepared a telescope and experimented, they came to know that universe was not constant. Then they agreed the big bang theory and Einstein stated that it was a mistake to tell that universe was constant. And the scientists later on found the sound waves which were released during the big bang explosion. The reason for the big bang explosion is still a mystery.