Nebula and Formation of a star.

Nobody knows why and how during/after the big bang explosion, a lot of fine dust was released. We call it cosmic dust. This cosmic dust is found in the universe in the form of super heavy dust clouds. These dust clouds can be spread off within more than billions of kilometres in the universe. 

But what are they made up of? Generally these clouds are made up of the same elements as of us. Yes the same hydrogen, oxygen, carbons and many many more elements known and unknown.

These dust clouds are the building materials for a star. And hence are called nebulas. A nebula is a massive dust cloud that forms a star when it cannot handle its own gravity.

Nebulas appear abstract and form beautiful aroras in the deep sky. The nearest Nebula to us is "The Helix Nebula" which is 700 lightyears away from earth. 

When finally, these dust clouds become so much massive, the dust particles due to their own gravity attract and collaps with a boom. And when the Constituent Particles inside this giant structure contract, its temperature eventually starts to increase. This stage of a star is called a protostar. 

At core temperature minimum 2000 Kelvin, the H² molecules initiate to break down into lone Hydrogen atoms. Eventually the core reaches the temperature of 10000 Kelvin and now it's too much closer of being called a star. The nuclear fusion begins and a complete new Star is born. This process of star formation takes about a million years from the time the initial dust clouds star to collaps until the final star takes birth and shines like our sun. 

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