Supernova

 Do you think this is a star ??

Then you are wrong cause it's not a star but an explosion.

 But it was a star ,before exploding.The life of this star have reached an end.

 Supernova is the term used for this explosion.Let's see it in   detail.

 A supernova explosion is always related to stars.There is always a star's case ,if not then   congratulation you have found something different.

A supernova have more energy than our star have provided in its whole life to us.Now thats too much of energy to control.these supernovas are the primary source of heavy elements in the universe.

According to NASA they are the most powerful explosions occurring in the universe.

On average, a supernova will occur about once in 50 years in a galaxy the size of the Milky Way. Put another way, a star explodes every second or so somewhere in the universe, and some of those aren't too far from Earth.

Fact-About 10 million years ago, a cluster of supernovae created "the local bubble" a 300-light-year long, peanut-shaped bubble of gas in the interstellar medium that surrounds the solar system.

The death of a star is depended on its mass ,the larger the mass it will have more chances of exploding.

For example: Our sun is too small to explode like a supernova ,and this would never happen in near 1,000,000 years .So don't worry of being killed by a star.

Like there are different season different planets there are different types of supernova occurring in the universe .At least we are able to know about  these two.It my sound similar as the star explodes in both the cases and releases tremendous energy.

You know if this energy is converted to electricity yand you have stored it somewhere then you and your kids and their kids and their kids and their kids........that's  all of your  successors won't have to give any money for electricity all life. Sounds nice hre that much energy.

Sun is too small

Type I supernova

Type I supernova lack hydrogen signature in their light spectra.Type I supernova are generally thought to originate from white dwarf stars in a close binary system. As the gas of the companion star accumulates onto the white dwarf, the white dwarf is progressively compressed, and eventually sets off a runaway nuclear reaction inside that eventually leads to a cataclysmic supernova outburst.

I easy words they don't have enough hydrogen to burn.These white Dwarf star  are compressed by their own gravity and their core becomes unstable and they explodes like hell.

Type II supernova

In either case we need a star several times more massive than our sun.i.e 8 to 15 times more bigger.
Imagine how big that could be. OMG!!!

• Gradually heavier elements build up at the center, and it becomes layered like an onion, with elements becoming lighter toward the outside of the star.
• Once the star's core surpasses a certain mass, the star begins to implode (for this reason, these supernova are also known as core-collapse supernova).
• The core heats up and becomes denser.
• Eventually the implosion bounces back off the core, expelling the stellar material into space, forming the supernova.    

But wait everything is not over yet,we have something left  after this supernova ,a neutron star.This is  a city sized star that could pack the whole mass of that star(exploded one) into a small itself.

Yeah, that's too small to see but yet it's bigger than any of us.