Did NASA ever find aliens on the second earth?

The second Earth, Kepler 452b, is an exoplanet newly discovered by the National Aeronautics and Space Administration (NASA). Its diameter is 1.6 times that of the earth, and its similarity index is 0.83. It is 65,438+0,400 light-years away from the Earth and is located in Cygnus.

This is the first "livable" planet discovered so far that revolves around the same type of star as the sun and is similar in size to the earth. It may have an atmosphere and flowing water. It is called Earth 2.0, that is, "the cousin of the Earth".

The orbital radius of kepler-452b is 1.046 astronomical unit, which is basically the same as that of the Earth. The orbit of revolution is slightly larger than that of the earth. A revolution takes 385 days, less than a month more than the earth.

Its diameter is 60% larger than that of the earth, its volume is five times that of the earth, its surface gravity is twice that of the earth, and its distance from the star is similar to that of the earth and the sun. Its star is1.500 million years larger than the sun, and its luminosity is 1.2 times that of the sun.

Due to the lack of density data, human beings can't judge its material composition. But according to the discoverer's "reasonable" guess, Kepler 452b is probably a rocky planet. However, Leslie A. Rogers, an astronomer at the California Institute of Technology, published a study in the Journal of Astrophysics, counting a large number of extrasolar planets with known sizes and masses, and proved that most planets with the same size as Kepler 452b are not rocky planets.

Therefore, it is not certain that it is a rocky planet. Therefore, cautiously speaking, it can't be said to be "another earth" at present, nor can it be said to be "another earth", but it can only be said to be an exoplanet that is "the closest to another earth so far"

Kepler-452b is the closest exoplanet to the Earth at present, which is a great achievement and milestone in the history of human astronomical exploration.

Kepler 452b is very important because it will show that there are many exoplanets outside the solar system. Before Kepler 452b was discovered, scientists did not find a livable zone in a star system similar to the sun. I hope statistics show that many similar planets surround other stars, but they don't use modern astronomical equipment for observation.

Many terrestrial planets discovered by human exploration, such as the' little cousin' and' big cousin' discovered by human beings, can study the past and future of the earth by comparison, especially through the' big cousin', which can let us see the future of the earth.

According to the information released by NASA, kepler-452b is located in the so-called "livable zone". In theory, there will be liquid water and an atmosphere suitable for life on the surface of the planet. However, experts say that even if a planet is in a livable zone, it cannot completely guarantee the existence of life. This is only the current theoretical calculation. And the distance from the earth is 1400 light years. According to the current fastest aircraft speed on the earth, it will take tens of millions of years to reach 452b, which has no practical significance for specific life exploration and immigration to this planet.