Is there a new earth in the world?

Dongfang. com reporter Edward Xu and Xie Min. Com, reported on July 24th that the National Aeronautics and Space Administration (NASA) held a conference call at noon on the 23rd local time (0: 00 Beijing time on the 24th) to announce an important discovery of Kepler's mission, saying that astronomers had discovered Kepler)452b, an exoplanet closest to "another earth" so far. This news "ignited" the domestic social networking platform late at night, and netizens responded strongly. Many people immediately said that they would pack their luggage and emigrate to "another earth". Some netizens who got up late this morning also found that their circle of friends had been screened by the news.

Is it possible for human beings to immigrate to this planet?

The reporter opened the NASA official website and read the original news carefully. Astronomers have discovered "Kepler 452b, the first earth-like planet orbiting a sun-like star and located in a livable zone." Kepler 452b is said to be an exoplanet, 60% larger than the Earth, with a rotation period of 385 days around its star, which is similar to the distance between the Earth and the Sun. Its quality and composition are unknown at present.

Kepler 452b is 0/400 light years away from Earth/kloc-and is located in Cygnus. If humans want to reach Kepler 452b, it will take about 500 million years by rocket. Even if we fly to this planet at the speed of 14 km/s before the New Horizon probe flies over Pluto, it will take about 30 million years to reach it.

Does "livable" mean suitable for human survival?

The "immigration" plan seems out of reach, but through the above text introduction, we see a word-"livable area". Whether "livable" means that there are signs of life on this planet; Whether it is suitable for human survival like the earth; Is this discovery really a step closer to the desire of human beings to emigrate to outer space?

Dr. Wang Lixin from Shanghai Observatory told the reporter that the "livable zone" refers to an annular zone with a suitable distance between planets and stars. Planets can receive the energy of stars in the "livable zone", and the livable zone has an environment suitable for life. However, even if a planet is in a livable zone, it is impossible to directly judge whether there is an atmosphere and a lot of water on the planet, so it is impossible to directly judge whether there is life on the planet.

Wang Lixin explained that it is difficult to determine whether the planet is a rocky planet like Earth or a gaseous planet like Jupiter, because Kepler telescope cannot determine the exact mass of the planet and cannot directly observe it. Others, such as what kind of atmosphere the planet has and what kind of material the surface is made of, are unknown at present.

So it is misleading to say that Kepler 452b is "another earth". At present, it can only be said to be an exoplanet "close to another earth".

As can be seen from the above, this newly discovered so-called another earth is meaningless to human beings, because it is too far away from us, and we can only dream about it!