How long does it take to immigrate to another planet?

There are 5 billion years left on the earth, and the ideal place for immigrants is Mars, which may become the second home of mankind in the future. After 65,438+0,000 years of transformation, Mars can be suitable for human habitation.

There are many planets suitable for human habitation, not to mention extragalactic systems, and there are many Earth-like ones in the Milky Way.

On April 25th, Beijing time, European astronomers announced on April 24th, US Eastern Time that a planet that may be suitable for human habitation was discovered for the first time outside the solar system, and there may be oceans and life on this planet.

The mass of this planet is about five times that of the earth, and it is 20 light years away from the earth. It orbits a red dwarf star named "gliese 58 1", so it was named "gliese 58 1c". Up to now, Gliese 58 1c is the smallest of about 200 extrasolar planets that have been discovered. In addition, its orbit is in the "habitable zone", and if other conditions are suitable, there may be surface water and life.

Gliese 58 1c was discovered by a team of European astronomers. At present, the team has written relevant papers and submitted them to the Journal of Astronomy and Astrophysics. However, Stephane Houdry, an astronomer at the Geneva Observatory and the main author of the paper, said that it is not yet possible to conclude that gliese 58 1c has liquid water. Sara Sara Seager, a planetary expert at the Massachusetts Institute of Technology, said: "If the atmosphere of gliese 58 1c is thicker than Venus, liquid water will be too hot to exist."

Two years ago, astronomers discovered a planet with similar mass to Neptune in Gliese 58 1 system. Later, astronomers discovered a suspected planet in Gliese 58 1 system, which is eight times the mass of the Earth. The discovery of new planets means that Gliese 58 1 will become the first choice for human space navigation in the future. Dimitar Sasselov, an astronomer at Harvard Smithsonian Center for Astrophysics, said: "This new planet is only 20 light years away from the Earth, and we are fully capable of reaching it."

In the search for Gliese 58 1c, Udry and his team used a spectral astronomical telescope with a diameter of 14 1 inch, which was located at the European Observatory. Before that, astronomers discovered that the smallest extrasolar planet was six times the mass of the earth, and the discoverers were Jeff Massey of the University of California, Berkeley and Paul Butler of Carnegie University.

Gliese 58 1c orbits the main star Gliese 58 1 once every 13 days, and the orbit is about 7 million miles away from the main star. According to the planetary model drawn by Sa Syrov and his colleagues, Gliese 58 1c is about one and a half times the size of the earth, and is mainly composed of rocks and water. He said: "The most exciting thing is that the new discovery tells us that there are many such planets. After billions of years of geological movement, such a planet may be more suitable for life than the earth. NASA's upcoming Kepler program may find hundreds of similar planets. "

Although the distance between Gliese 58 1c and the main star is much smaller than the distance between the earth and the sun, the brightness of Gliese 58 1 is only 1% of that of the sun, so the distance of 7 million miles does not affect the living. Udry said that the temperature of Gliese 58 1c depends on its albedo. Taking the Earth and Venus as reference objects, he predicted that the surface temperature of gliese 58 1c would be between 0 and 40 degrees Celsius. (Martin)