Is there a second earth?

Yes, NASA announced an amazing discovery on its official website on February 5th, 20 1 165438. Scientists from NASA used the kepler mission to find a livable planet in another galaxy about 600 light years away from the Earth. This planet, named Kepler -—22b, has a moderate surface temperature and probably contains liquid water, and revolves around a star similar to the sun. Space experts said that this is an important milestone in the search for a "new earth", but it is impossible to immigrate to Kepler -—22b.

NASA: Humans will no longer be lonely.

According to the official website of NASA, since February 20 1 1, scientists have discovered more than 1000 "candidates for the new earth" through the kepler mission project, bringing the total number of "candidates" to 2,326, but only 10 of these "candidates" is related to the earth. Moreover, whether these more than 2000 stars are real planets remains to be further confirmed by scientists. So far, only 29 planets have been confirmed as real planets, including Kepler -—22b, but scientists believe that most "candidate" planets will eventually be confirmed as real planets.

Kepler -—22b is the smallest and most livable planet with liquid water on its surface. Its radius is about 2.4 times that of the earth. The star it surrounds belongs to the same level as the sun and becomes a G-shape, but the temperature is slightly lower and the volume is slightly smaller than the sun. At the same time, Kepler -—22b planet's other innate conditions are very good: its relative position to the star belongs to the middle of the "livable zone" that scientists think, and it is close to the distance from the earth to the sun, which ensures that its surface temperature will not be too high or too low; The period of its revolution around the star is 290 days, and its orbit is similar to that of the earth. According to another source, scientists say that the average surface temperature of this planet is about 265438 0℃.

At present, scientists don't know whether the main component of Kepler -—22b planet is rock, gas or liquid, but its discovery does make human beings go one step further in the search for planets similar to Earth.

Expert: It takes at least 1 10,000 years for humans to leave the solar system.

The discovery of Kepler 22b excited the entire NASA staff. Douglas hudgins, a scientist of Kepler Project in Washington, DC, said that the discovery of Kepler -—22b was "an important milestone in the process of discovering the earth's twin brothers". Related research results will be published in the American journal Astrophysics.

Zhu Jin, director of the Beijing Planetarium, poured cold water on these netizens: "The current level of science and technology of mankind is absolutely impossible to leave the solar system, and it is impossible to immigrate to the solar system now and in the future!"

Zhu Jin said: "At present, the farthest probe launched by human beings is Voyager 1 in the 1970s, but it has only flown near Pluto for more than 30 years, and the flying distance is one thousandth of the radius of the solar system. At the current level of science and technology, it will take at least/kloc-0.0 million years for human beings to leave the solar system, and the problems of migration, communication and human life cannot be overcome. So humans can't overcome it at all.

"Although this planet may be really beautiful, thinking and doing are two different things. If "space migration" is to be carried out, the level of science and technology needed by mankind will be higher than we can imagine. At the current level, it has been a great progress for humans to go to Mars, and even if they go to Mars, they may not be able to come back. "

This Earth-like star has not been observed in China.

Coincidentally, Pang Zhihao, a researcher at China Academy of Space Technology and deputy editor of International Space magazine, also said that it is almost impossible for human beings to immigrate to this planet: "From the current technical level, it only takes less than 520 days for a probe launched by human beings to go back and forth to Mars, let alone go to a planet 600 light years away."

Pang Zhihao believes that "what human beings can do now is to observe whether there is life on this planet with astronomical satellites. Astronomical observation satellites launched by the United States and Europe are currently capable of making such astronomical observations from distant places, which will be of great research value. Although the accuracy of this observation is not high, it is still impossible for humans to launch detectors there, even outside the solar system. " Pang Zhihao also said that there are no astronomical observation satellites in China at present, so Kepler -—22b cannot be observed.