What happens when the sun dies?

From the movement of the birth, every star destines to die. One day its fuel will run out. Our sun is no exception. Every second it burns 600 million tons of hydrogen fuel in its core. At that rate, the hydrogen will run out in about 7 billion years.

As the hydrogen gets used up, It slows down the fusion at the star core. With less fusion pushing outward, gravity crushes the star on itself. But due to stronger fusion star outer layer gets heated. (When you heat a gas it expands) So, the sun will expand up. Our sun will become a Red giant.

The temperature on Earth will reach up to thousands of degrees. Then, the bloated sun will engulf the Earth. But the giant red sun is self-destructive. Its core becomes dangerously unstable. With no hydrogen left to fuel it, the sun began burning helium and fusing it into carbon. The sun will now destroy itself from the inside out, blasting energy from its core to its surface. These energy waves blow away the sun’s outer layer, slowly it disintegrates and the star will be dead. All that remains is an intensely hot dense core. The red giant will become a white dwarf.

The fusion process is stopped and the engine finally (sun burning) comes to rest. Our sun white dwarf stage will be no larger than the earth. But a million times denser. At the heart of the white dwarf, astronomers believe there is a giant crystal of pure carbon.

That means, One day our sun will look like A diamond in the sky.