GENERAL KNOWLEDGE

Detailed explanation-1: -After spending about 1 billion years as a red giant, our own sun will become a white dwarf, packing most of its initial mass into a sphere roughly the size of Earth. This fate awaits many other stars as well-all of them that are less than about eight times more massive than the sun, in fact.

Detailed explanation-2: -The Sun is currently a main sequence star and will remain so for another 4-5 billion years. It will then expand and cool to become a red giant, after which it will shrink and heat up again to become a white dwarf. The white dwarf star will run out of nuclear fuel and slowly cool down over many billions of years.

Detailed explanation-3: -Once the Red Giant phase is complete the Sun will evolve into a White Dwarf, during which it will lose about half of its mass. As the Sun loses mass the radii of the orbits of the remaining planets, from Jupiter outward, will increase, but still remain in orbit around a now lighter Sun.

Detailed explanation-4: -What happens next depends on how massive the star is. A smaller star, like the Sun, will gradually cool down and stop glowing. During these changes it will go through the planetary nebula phase, and white dwarf phase. After many thousands of millions of years it will stop glowing and become a black dwarf.