The Sun is approximately in the middle of its life. When the Sun dies, the entire Solar System will die with it.
The death of a solar system depends on the size of its star. The Sun is a medium-sized star, classified as a yellow G-type dwarf, very common in our galaxy. It is too small to become a great supernova and explode. Instead, it will wear out little by little. First it will become a red giant and finally it will run out like a weak white dwarf.
Within 5,000 million years, the Sun will have consumed all the fuel in its core, hydrogen. Then, it will begin to merge helium. It will get bigger and turn red. Its size will be ten times what it is today, and it will occupy the whole sky ... and more.
It will swallow all the planets of the inner Solar System: Mercury, Venus, Earth and maybe Mars. The rest of the planets will be blackened by heat and intense radiation. The red giant phase will last millions of years.
When helium also runs out, it will fuse carbon for some time. But when there is no fuel left for more nuclear fusions, the gravity of its core will cause it to shrink. The entire mass of the Sun will be crushed in its nucleus and will become a white dwarf.
By then there will hardly be anything left of the Solar System, since the radiation will be over with everything.
The Sun will still live several million years more like a white dwarf. But it will be so weak that its gravity will not have the strength to hold the Solar System together. The heliosphere and the heliopause will have been destroyed. The remains of the Solar System will be exposed not only to the last waves of radiation from the Sun, but to the powerful interstellar rays.
The atoms of what was once the Solar System will spread throughout the galaxy.
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