Origin of Universe – The Big Bang Theory

The Big Bang Theory

The Big Bang Theory, also called the “Expanding Universe Hypothesis” is one of the most popular origins of

universe theory.

Edwin Hubble provided evidence that the universe is expanding in 1920.

  • With passage of time, the galaxies move further apart.
  • Similarly, the distance between the galaxies are found to be increasing and hence, the universe is considered to be expanding.

While Scientists believe that even though the space between galaxies is increasing, the empirical observations don’t support the theory of expansion of galaxies.

The following observations have been made according to the Big Bang Theory about the different stages of the development of the universe:

At the start, the whole matter of the universe existed in the form of a concentrated tiny ball having a vast amount of volume, infinite density, and infinite temperature.

After the Big Bang, this “tiny ball” exploded.

  • As a result of this, a huge explosion took place.
  • This Big Bang took place 13.7 billion years ago.
  • Even today, the expansion of the universe continues
  • After the initial rapid expansion within fractions of a second, the expansion slowed down.
  • It is generally accepted now, that within 3 minutes of the Big Bang, the first atom began to form.

Within 300,000 years from the Big Bang, temperature dropped to 4,500K (Kelvin) and gave rise to atomic matter. The universe became transparent.

Credits – BigThink

An expansion of the universe indicates the increasing space between the galaxies.

Hoyle’s concept of steady state is an alternative to the Big Bang Theory.

  • This theory says that the universe is more or less the same at any given point of time.
  • However, with the recent evidence, it has become clear that the expanding universe theory is the most acceptable.

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