Extraterrestrial life may or may not be believed, especially since we still have no evidence of the existence of alien civilizations to this day, but studies such as the latter provide useful data for organizations such as SETI and the Breakthrough Listen Initiative, which are still actively looking for such activity. To date, most of the exoplanets found by astronomers have been detected using the transit method - this involves observing the passage of a celestial body through the disk of another celestial body, because when a planet partially obscures a star, it can be detected by analyzing the slight fading of the star's brightness.
As a result, scientists are able not only to confirm the presence of exoplanets, but also to characterize their atmosphere. This is very useful when looking for extraterrestrial civilizations as organic life and industrialization leave their mark on the planet's atmosphere. Our planets could theoretically also be spotted and analyzed by an alien civilization using this method - if a distant astronomer were to observe our planet and its position in relation to the Sun, it would surely detect atmospheric chemicals that indicate our presence.
In the new study, astronomers have identified as many as 1,004 main sequence stars, many of them sun-like, that are able to "host" habitable planets, from where alien civilizations could detect life on ours using the transit method. The team found these planets using data captured by NASA's space telescope, namely the Transiting Exoplanet Survey Satellite (TESS), which scans the entire sky for planets orbiting bright stars in our immediate vicinity, with particular emphasis on planets similar in worldtoptech to Earth . All of the indicated stars are within 33 light years of Earth, which is close enough to detect markers of life in our atmosphere. In short, if one of them has life on it, maybe it will eventually notice ours and make an attempt to contact us.