There are several theories that says that nothing existed at one point : no stars, no planets, no galaxy, not even the space. The matter that made everything that exists now and which is very dense in nature is called Singularity. The Force of gravity in a singularity is so great that the fabric of space time curves in itself. In an instant known as BIG BANG. The contents of singularity escaped and formed the universe… Our Universe.

                    It was an instant expansion that within few seconds it created nuclear reactions that produced protons, neutrons and electrons that formed the structure of matter today.

Then came the stars, when we look above in the sky in night we see stars “looks beautiful- Right?”  Have you ever thought the stars that looks beautiful in the night, how they born ?? 

Well..here is the ans- Stars are born in large size of interstellar and hydrogen gas which is called as Nebula. It represents the building blocks of star, galaxies and planets in the universe. there are different types of nebulae.

1- Emission nebulae are hot, discrete clouds of primarily ionized hydrogen that glow with their own light. 

2- Reflection nebulae emit a bluish glow by reflecting the scattered light of nearby stars.

3- Absorption nebulae or dark nebulae, comprise dense clouds of gas and dust.

Nebulae forms when stars die. When the end comes for our sun, for Eg- its out layer will heat, swell and eventually blow off and the hot dead core will create a glowing nebula, which will in turn become a nursery of new stars.

Many stars formed millions and billion years ago, these are balls of gases (mostly hydrogen and helium). They create energy by fusing hydrogen and turning it into helium into their core, we see the resulting energy as starlight. Our astrologers classify them on the basis of their size, temperature and color. Massive stars are hot and blue, whereas the small stars are cool and red. Also, their mass and size decides there life. 

Our Earth and other planets of our solar system is a product of explosion happened almost 5 billion years ago and our universe if still expanding…

Isn't it beautiful…. beginning of our universe, humans, billion years ago with a massive blow of BIG BANG.. There are some theories which also says that one day it will end, our sun, stars, universe….we cannot stop the future but we can know how it all started, what happens above the sky that we cannot see from our naked eyes…

Share your thoughts on our universe in the comments below.