User:Cosmic Cloud/sandbox

One of the greatest discoveries of all time is the discovery of gravity. We all know how an apple fell on Newton's head that made him come up with the idea. But do we ever think if we could reverse the direction of that apple and hence prevent one of the biggest discoveries of mankind. Lets take another example, suppose you're holding a glass full of water and suddenly it fells out of your hand spilling all the water onto the floor, now think what if you could reverse the direction of every single particle, every single molecule resulting into the same glass of water as it was before. But we do not see that happening in real life and that's where the term 'Entropy' kicks in.

Entropy can simply be defined as the state of randomness and disorderness but it is much more than that. Entropy defines the arrow of time. Every process in the Universe is associated with the rise of entropy with the passage of time or we can say that the degree of disorderness of the Universe is bound to increase in one direction of time i.e the forward direction.

Since we are stating that the entropy increases in the direction of time, we can conclude that there must have been a point when the total entropy of the Universe was minimum or zero. This point of time referred as the Big Bang which is ultimately taken as the starting of the Universe and time and our very own existence. The Universe we live in today is an elevated state of Entropy risen during the expansion of the Universe of its initial stage called the Big Bang.

Reference:

https://www.youtube.com/watch?v=LzvkO5ai9YQ