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Life of a star

Sun, a star which is the source of all the life forms on earth is a star, a star which have only half of its life left. So you might be wondering what happens when a star dies, thus following are the whole life cycle of a star :-

1. Nebula.

Nebula is basically a lump of dust which consisting hydrogen, helium and many other gases. It is a the first phase of a star or could be said as it's birth place as well. When a nebula collapses, all its gases and dusts combines to form another celestial body called as "Star".

2. Star.
Sun

This is the infancy period of a star. Star is sphere of plasma born from nebulae which contains gases like hydrogen and lithium. The temperature of a star varies from 2,000° C to  30,000° C. A star produces its own heat and light due to the continuous nuclear fusion. 

3. Red Giant.

As the time passes, the surface of a star becomes colder while it's size increases. Despite of having a cold surface, it shine many times brighter than its previous form. The temperature of a red/big giant is about 2000-3000° C.

4. Neutron star.
Star

After the nuclear reaction on a star stops, it gets crumbled and although its mass remains the same, the diameter of a star decreases. Due to the decrease in size and increase in mass, the gravity of the star (neutron star) increases. As the gravity increases, a neutron star starts sucking up its remaining surroundings like planets, meteorites, gases etc it explodes.

5. Supernova.

There are two causes of a supernova explosion

  1. In the case of white dwarf :- When a star(white dwarf) sucks the matter from another weaker star, it becomes unbearable for the remaining star to cope up with the weight of all that matter and it explodes.
  2. In case of neutron star :- When the nuclear fusion on a star stops, its mass shifts to its centre which results in the creation of neutron star. After that it explodes resulting in a supernova.

6. Black Hole.

It is the last stage of a star. It is believed that black holes are formed when a star dies. Black hole tends to have a huge gravitational force which is even greater than a neutron star. It has so much gravitational force that even light rays are unable to reflect from it, thus no one has seen a black hole.

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