When will the earth disappear?

In about 5 billion years, the earth will disappear from this world. When the sun "erupts", it is the time when the earth dies.

The sun is now in the main sequence star stage. At this stage, the radiation energy generated by the "proton-proton" nuclear reaction of the central core is enough to resist its own gravity, and its volume is basically balanced without shrinking. When the hydrogen in the center burns out, the sun will not be able to resist its own gravity and collapse. The compression of volume (work) will make the temperature of the center rise above15 million degrees Celsius. At this time, the outer edge of the sun center is heated to more than 6.5438+million degrees and the hydrogen in its outer layer is ignited, that is, the nuclear reaction of hydrogen polymerization into helium occurs, which will occur along the radiation layer and atmosphere of the sun. The released heat energy makes the outer layer of the sun expand rapidly (that is, the central part of the sun is shrinking while the outer layer is expanding). The volume will expand to thousands of times now, and the sun will become a big red fireball. This is the red giant stage of the sun, that is, entering the old age of the star. Even Mars will be swallowed up by it, and the earth is doomed. But this day will come in 5 billion years, so don't worry.