When and how our Sun will die?

Hey guys! I'm here with my another blog.

In today's blog we will see the full story of our one and only star, the sun.

What comes in your mind, when someone talks about sun. Yeah, I know a giant fire ball.

The Sun provides light and energy for free, no complaints and demands. But what you people think, will the sun always be there for us?

The scientists made prediction about the end of our solar system, when that will happen? And bad news, human won't be there to see the final act. But why?

History of the sun:-

Image credit
https://en.wikipedia.org/wiki/Sun

The sun was born about 4.5 billion years ago, when the cloud of dust and gas called nebula collapsed under its own gravity and surrounding a disk of matter. At that time there was no planet, just a disk like matters around the newly born sun.

These matters later collapsed to form planets revolving around the sun, earth was one among them.

This is how our earth found a home.

Our sun is made up of mostly hydrogen (70%), and helium (28%). Carbon, nitrogen and oxygen make up 1.5% and other 0.5%.

How large is our earth is? Pretty large.

Do you know that our sun can fit more than 1.3 Million earths? Now that's big.

Now our sun is about 4.5 billion years old, and what do you people think for how long our sun will be with us?

What happens inside the sun:-

Our sun deals with  two of major forces present in the universe.

There is the core inside the sun which pushes the nuclear fire towards the surface of earth, at the same time the sun's own gravity pulls it inwards to contract. This equilibrium will be stable for around 4 billion years.

As we know that the sun's fuel is hydrogen, but what will happen where there will be no fuel?

Death of the Sun:-

Our sun will die when there is no fuel remaining that is hydrogen.

The core of the sun will start shrinking, and the surface will be expanding in the same proportion. It is predicated that the surface of the sun will expand out to the orbit of Mars.

The brightness of  the sun will be increasing 10% for every billion years. This doesn't sound like much but the 10% of heat produced by the sun will end the life on earth.

Oceans will evaporate, surface will become too hot for water to form and your body won't be able to resist this crisis.

Now, does human have to worry?

If you ask me, I'll say it loud, NO.

Let's be practical. Humanity only has about 1 billion years left unless we find a way off this planet.

As the sun's core shrink and surface in increase in same proportion, it will become a red giant star, which will be about 100 times of the older sun.

But why not a bright planetary nebula?

Earlier studies showed that for a star to become a bright planetary nebula it needs to have up to twice as massive as the sun.

Image credit
https://simple.wikipedia.org/wiki/Red_giant

When a star dies, it ejects a mass of gas and dust known as its envelope into space.

The envelope can be as much as half the mass of the star. This reveals the star's core, which by this point in star's life is running out of fuel.

The core of the sun will be harder than now, and when the sun is brunt through its helium, it will become highly unstable and will cast off its outer layer into the space, and will remain just as 1/100th of earth, that's tiny, which is called as white dwarf and will keep on shining for around another 100 billion years.

Humans by that time could even imagine that this little white dwarf once was the most essential star for life on earth.