In 326 light regions, they have been able to discover Earth from 1,715 star systems, according to a scientific paper published Wednesday over the past 5,000 years.
The authors, Lisa Kaltenegger, chair of the Carl Sagan Institute at Cornell University, and Jackie Varty, senior researcher at the American Museum of Natural History, counted precisely which stars exoplanets perceive the effect of Earth’s passage before the sun. According to their calculations, over the next five thousand years, 319 star systems will have a chance of discovering us.
In their work, the researchers used the European Space Agency’s Gaia catalog.
Gaia provided a very accurate map of the Milky Way, allowing us to move forward or backward in time and see where the stars are and where they are heading.
may not see
The Ross 128 system, which is 11 light-years away and is the second closest star to an Earth-like planet, can see Earth pass before the Sun for 2,158 years. Their window opened 3,057 years ago and closed 900 years ago.
The Trappist-1 system, which contains seven Earth-sized planets, four of which are in life-friendly zones, enters a state called the Earth transit zone after 1642, whereby the planets of the solar system can be identified by blocking sunlight looking for exoplanets the same way The people of the earth are searching for it.
We’ve been using radio for about a hundred years. In a hundred light years, there are 75 stars where we can receive artificial radio signals. Of these, there are 29 stars on an exoplanet that can not only receive radio signals, but also see the transit of the Earth.
What really shocked me is how few stars can be seen on Earth from within a hundred pars
Beth Beller, a professor at the University of Edinburgh, told the Guardian the finding was very important for meaningful extraterrestrial research programmes.
The transit method only allows to identify an exoplanet at a narrow angle. Now I am also interested in the stars according to the Gaia catalog which have the correct viewing angle for the radial velocity method or direct detection.