It is said that humans may migrate. Is it true?/You don't say.

If they are immigrants, I think only Enceladus and Europa in the solar system have such conditions, because according to scientists' judgment, these two satellites may have life, liquid oxygen and solid water (ice).

Such conditions are suitable for human development, construction and utilization. On Mars, according to the observation of American observers, solid water (ice) exists only in the polar regions of Mars. In addition, the oxygen content in the Martian atmosphere is also very scarce, only about 3% (carbon dioxide and other gases account for about 97%).

As for the question "How long is the life of the earth", I think there should be three overall answers.

1. Due to the demise of the earth itself.

The earth will perish for its own reasons. Such as: volcanic eruptions, earthquakes and other natural disasters. (Of course, this refers to global volcanic eruptions and earthquakes caused by the earth's violent internal effects. But this possibility is very small, only about 1% chance. )

2. perish because of the explosion of the sun.

Now, scientists predict that the life of the sun will reach 5 billion years. After 5 billion years, the sun will burn out because of the internal hydrogen fuel. Because its core can't support its gravity, it will burn its fuel explosively, become bigger and become a red giant. It will annex Mercury, Venus and the Earth one after another, and then it will begin to shrink and finally become a white dwarf. Therefore, the earth will die with the death of the sun.

3. Death due to planetary collision or galaxy collision.

This reason is the most likely. Since 1993, when scientists observed that 13 asteroid hit Jupiter, all kinds of sci-fi movies about asteroids hitting the earth in the world (especially in the United States) proliferated. I think you should have seen some, too. Although it is a science fiction film, it is still scientific. Many prophets have predicted that asteroids will hit the earth.

Such historical facts also exist, for example, an asteroid hit the earth 65 million years ago, making dinosaurs extinct.

Fortunately, the earth is closer to Jupiter, the fifth largest planet in the solar system, and Jupiter is also the largest of the eight planets in the solar system (June 5438 +20061October, the International Astronomical Congress decided to "downgrade" Pluto, the ninth largest planet in the solar system). This has become a natural protective barrier, attracting asteroids that are about to reach the earth to themselves with its great gravity, thus greatly avoiding the chance of asteroids hitting the earth.

But it can't be completely avoided, such as the big impact of 65 million years. Scientists judge that this asteroid is more than 800 kilometers in diameter. 13 When the asteroid hit Jupiter in 1993, there were two asteroids with a diameter of more than 800 kilometers, and there were 1 asteroid with a diameter of 800 kilometers. The impact was spectacular, and the energy released was equivalent to the energy released by 654.38+100 million tons of hydrogen bombs. (think about it, if an asteroid hits in this era, although it can be detonated with a nuclear bomb, it is still more difficult. )

The probability of galaxy collision is much smaller than that of asteroid collision. In 2005, astronomers observed that Andromeda galaxy was approaching the solar system at a speed of 160 km per second. It will collide with the solar system in about 4.6 billion years (this is 5 billion years before the death of the sun)

An impact may destroy the solar system or Andromeda galaxy, or the two galaxies may merge.

But scientists have found that the Andromeda galaxy changes direction when it moves. At present, the direction has changed. ) The probability is 999%0.

Haha, it depends on the author's textual research. Shrimp is not much to say.

Thank you.