“Three hundred million planets like Earth”



Are you looking for a planet to move to? The global real estate market seems to be full of offers. Our galaxy must contain at least 300 million Earth-like planets, and probably many more, according to the largest study of its kind. The findings have been accepted for publication in the prestigious Astronomical Journal, but are available as a pre-publication here. Kepler Legacy They have tried to give an answer, albeit an approximate one, to a question that has occupied their industry for years. This number expresses the percentage of stars like the Sun that have Earth-sized planets in the so-called habitable zone – that is, in orbits that allow liquid water to exist on the surface. The calculation of the UN was one of the main goals of the Kepler Space Telescope , which was launched in 2009 to locate any extraterrestrials in an area of ​​the Galaxy containing about 150,000 stars. Although Kepler crashed its navigation system before completing the census, it managed to identify more than 4,000 candidate planets before finally ceasing to exist. “It took 11 years from the launch to the publication of the study, but these are the results,” Natalie Batala, an astronomer at the University of California, Santa Cruz, former head of the Kepler mission and a member of the research team, told the New York Times. team that signs the new study. “This is the scientific result we all expected – the l “Kepler was approved in December 2001,” she said cheerfully. “Conservative assessment” The research team spent two years analyzing Kepler data. Applying statistical methods to reduce the telescope’s findings to the entire galaxy, researchers estimate that at least one-third of the Sun-like stars, in terms of mass and brightness, have Earth-sized rocky planets within The researchers point out that this estimate is conservative and that the actual ratio may reach 90% of the stars that look like the Sun. Whatever the deviation from reality, the conclusion is that the Galaxy is full of planets with diameter from 0.5 to 1.5 times the diameter of the Earth. According to the most conservative estimates of NASA, the Galaxy contains at least 100 billion stars, of which 4 billion look like the Sun in size and brightness. Assuming that only 7% of these stars have planets in the habitable zone, the number of potentially habitable planets reaches 300 million. pointed out to the NY Times Ravi Kumar Koparapou of NASA, a member of the research team. “So we deliberately lowered the estimates,” he said. About four potentially habitable exoplanets must be hidden in the Sun. Reservations The new estimate gives twice the potentially habitable planets in the Galaxy compared to the previous study on the subject, published in 2013 and concluded that only one-fifth of stars like the Sun have The new study improved the calculations by combining Kepler data with the findings of the European mission GAIA, which measured the position and brightness of one billion stars in the Galaxy. Still, the study’s findings are only estimates and not real numbers. And some astronomers seem to be skeptical of the findings. “The Kepler mission did not find many (exactly none) real analogues of Earth. That is, planets with the same radius AND the same orbital period, so that it receives the same intensity of light, AND in orbit around stars like the Sun “pointed out in the newspaper David Charmone of the Harvard-Smithsonian Center for Astrophysics. In addition, no one knows what conditions However, even if the latest calculations fall completely out of the question, this does not mean that hopes of locating extraterrestrial life are fading. In recent years, a number of planets orbiting around have been discovered. “Red dwarfs”, small, pale, reddish stars. According to previous studies, at least a quarter of the red dwarfs in the Galaxy have planets in the habitable zone. The search for a new Earth has just begun. Follow it on Google News and be the first to know all the news See all the latest news from Greece and the world, in the



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