Cornell University scientists and the American Museum of Natural History found 2034 close star systems, from which it is possible to detect the land by the transit method when the planet crosses the parent star disk, causing the brightness of the latter. All these stars are within 326 light years (one hundred parseca) from the solar system, and about a hundreds reached artificial radio signals from the ground. On exoplates, some of them may exist hypothetical extraterrestrial civilizations. Astronomer’s article was published in the Nature magazine.
Since the angle under which the system of the Earth-Sun from other stars is visible, it is not always possible to observe how the earth passes against the background of the sun disk. Scientists found out that among 2034 stars in 319 transit can be observed over the next five thousand years, that is, they will enter the transit area of the Earth (coincides with the plane of the ecliptic). 313 stars have already come out of the transit zone of the Earth in previous five thousand years, but they caught the heyday of modern human civilization. 1402 stars are in the transit zone today and will be in it for some time.
Radio signals that human civilization began to be emitted into space about a hundred years ago, have already reached 75 stars, which are located within the sphere of 30 parses with a radius (one parseca is 3.26 light years).
Among 2034 stars Most (1054) belong to red dwarfs, 194 stars are similar to the sun, 109 are white dwarfs, the rest are class A stars (white-yellow dwarfs, 12 stars), class B (white-blue, two Stars), class F (yellow-white, 87 stars), class K (orange, 102 stars). Eight stars belong to dark red (classes L and T). 12 stars are at the giant stage.
It is known that seven stars from the list have exoplanets, four of them are within one hundred light years from the ground. Ross128, removed from the Sun for 3,375 parses, is the 13th closest star and the second in proximity to the system with an exoplanet, comparable by mass with the ground. From this planet, it was possible to observe the lands transit from 3057 to 900 years ago. Tigarden’s star system, the 25th system, the closest to the Sun (3,832 parses), contains two land-like exoplans. It will enter the transit area of the Earth in 29 years and will last 410 days in it. Finally, the Trappist-1 system (12.4 parties), a famous fact that seven exoplanets immediately enters it, will enter the transit zone in 1642 and will be there 2371 years.
According to experts, there are 508 rocky worlds in the entire sample of stars. Taking into account the area, which reached radio waves, 29 potentially inhabitable worlds may detect the land with the transit method and catch radio signals from it. The results of the study show that even with the closest to the solar stars you can observe the transit of the Earth and classify it as the inhabable world, therefore, is true. If there are populated planets next to the land, there are long “windows”, during which we can observe them.