A "super earth" suitable for interstellar immigrants to live in.

American scientists published a report that they discovered this "earth-like planet so far" by using the Kejak telescope in Hawaii. It is a rocky planet, located in Libra, about 20 light years away from the earth. It orbits the Libra red dwarf gliese 58 1. Six planets have been discovered in this galaxy so far, and astronomers named this newly discovered "super earth" Gliese 581g.

Gliese 58 1g planet is located in the blond region of the red dwarf gliese 58 1. The so-called "livable zone" refers to the area where the distance between the planet and the star is suitable. In this region, the heat transferred from the star to the planet is moderate, and the planet is neither too hot nor too cold. It can also make liquid water form ocean conditions.

The mass of Gliese 58 1g is about 4.3 times that of the earth, and the gravity is 1.6 times, which is enough to retain water. Like Mercury in the solar system, this exoplanet gliese 58 1g is also "locked" by its star, which means that one side of this planet almost always faces the star, while the other side almost always faces the star, so the surface temperature difference is large. The researchers speculate that the average surface temperature of the planet is between -3 1 celsius and-12 celsius. A super earth whose mass is less than 0/0 times that of the sun/kloc-was discovered.

Of all the exoplanets that have been discovered, most are within Jupiter's range, and only 10 is less than 10 times the mass of the earth (excluding pulsars and extrasolar planets).

The smallest one, 3.3 times the mass of the earth, is located in Sagittarius, 3200 light years away from the earth, and was discovered by the "microgravity effect" method. On June 9, 2009, at 65438, a super earth HD7924b was discovered, with the mass 9.22 times that of the sun, and the distance from the star HD 7924 and astronomical unit, period of revolution, was 5.4 days. Star HD7924 is located in Cassiopeia, with apparent magnitude of 7.2, spectrum K0V, distance of 54.8 light years and surface temperature of 5 177.

Planet name/planet mass (1for the earth)/constellation/distance (light years)/star mass (1for the sun)/discovery method

Moa -2007-BLG- 192- lb 3.3 Sagittarius 3200 0.06 microgravity

HD40307b 4.20 easel 4 1.7 visual speed

HD40307c 6.87 easel 4 1.7 visual speed

HD40307d 9. 16 easel base 4 1.7 apparent speed.

Gl58 1c 5.02 Libra 20.4 0.3 1 apparent velocity

Gl58 1d 7.73 Libra 20.4 0.3 1 apparent velocity

Ogle -05-390 lbs. 5.40 Scorpio 2 100 0.22 microgravity.

Gliese876d 5.72 water bottle 15.4 0.32 apparent velocity

HD7924b 9.22 Cassiopeia 54.8 0.83 apparent speed

HD 18 1433b 7.57 peacock 85.2 0.78 apparent velocity.

The real "Earth-like planets" should be below 1.3 times radius of the earth, and their discovery is still expected. brief introduction

Gliese 876d, the super earth, is a typical representative of the super earth. In view of the relatively large mass of the super earth, there is a certain gap with the earth in physical characteristics. The research report of the team led by Diana Valencia on gliese 876d shows that the composition and structure of the super earth can be inferred by using the transit method to detect the radius of the planet and its corresponding mass. By calculating the planets orbiting Gliese 876, the range can be from a solid planet with a distance of 9200 km (about 1.5 times that of radius of the earth) to a liquid planet with a core exceeding 12000 km (about twice that of radius of the earth).

Within this radius, the surface gravity of the super-earth gliese 876d is between ~3.3g and ~1.9g. The huge surface gravity (usually larger than Neptune-like planets and terrestrial planets, and in some cases larger than woody planets) is a well-known feature of the super-earth.

temperature

The first is the temperature. Because the red dwarf "Sun" of this planet has low temperature and insufficient illumination, even if it is at a moderate distance from the "Sun", the surface temperature will be very low. Scientists estimate that the temperature on this planet is only about -200℃, which is equivalent to the surface temperature of Uranus. At such a low temperature, it is almost impossible for life to survive on it.

atmosphere

Followed by the atmosphere. There is no atmosphere like the earth on this planet, and it seems impossible to produce another atmosphere, which is very different from the earth, Jupiter and Saturn.

arouse

Scientists have gained great enlightenment from the discovery of super-earth gliese 876d. In the Milky Way, this earth-like planet seems to be "ordinary", but it has never been discovered.

"This kind of' super earth' should be many in the Milky Way, and there should be such planets near about 35% of the stars." Scientist Gerd said. Therefore, scientists intend to use gravity microscope to scan the Milky Way again, so as to find the missed Earth-like planets.

Astronomical scientists have discovered for the first time the first planet outside our solar system that can support life. Neither too hot nor too cold. And gravity like the earth. The probability of life survival is 100%, not to mention the possibility of alien life here!