The Amazing Big Bang Theory.

The Amazing Big Bang Theory.

We all are familiar of the term the universe and the Milky Way galaxy but there was a time billions of years ago when none of these existed. We can’t even imagine it right?

Well this is true and our universe, the galaxies all began with a bang, a big bang.

Scientists believe that the universe began with a bang about 15 millions of years ago. At the very beginning, the universe was just a minute hot ball, many times smaller than an atom. Inside this ball was everything to needed to make the universe.

In the 1930s an American astronomer Edwin P Hubble discovered that light from all distant galaxies is coming from a receding source. This is the only possible explanation of the light spectrum is shifted towards the red end. The real fact is due to Doppler effect .in 1948 George Gamow a Russian-born-American physicist in a theory concerned with the origin of the light elements, interpreted the Doppler effect as demonstrating the that the universe was expanding, which simply means that it had originated in a single point billions of years ago. This idea got wide support and British cosmologist Freud Hoyle in a highly critical and satirical manner referred to it as ‘Big Bang’ hypothesis.

There are evidences for the Big Bang theory:

• First of all, we are reasonably certain that the universe had a beginning.
• Second, galaxies appear to be moving away from us at speeds proportional to their distance. This is called "Hubble's Law," named after Edwin Hubble (1889-1953) who discovered this phenomenon in 1929. This observation supports the expansion of the universe and suggests that the universe was once compacted.
• Third, if the universe was initially very, very hot as the Big Bang suggests, we should be able to find some remnant of this heat. In 1965, Radio astronomers Arno Penzias and Robert Wilson discovered a 2.725 degree Kelvin (-454.765 degree Fahrenheit, -270.425 degree Celsius) Cosmic Microwave Background radiation (CMB) which pervades the observable universe. This is thought to be the remnant which scientists were looking for. Penzias and Wilson shared in the 1978 Nobel Prize for Physics for their discovery.

Finally, the abundance of the "light elements" Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins