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In search For alien life, we are usually those doing This SnoopBut Lisa Kaltenegger, an astronomer at Cornell University, wants to know who might be watching outside we“For whom are we aliens?” she asked.

Therefore, Kaltenegger got help from Jackie Faherty, an astrophysicist working at the Hayden Planetarium at the American Museum of Natural History in New York City. Together, they undertook the task of identifying possible extraterrestrial worlds, where residents-past, present or future-have the opportunity to detect that the Earth is a transiting exoplanet. This means that their planet will have the correct vantage point, and a slight decrease in the brightness of the sun can be observed when the earth passes or passes in front of it. This is the most successful method that we people on Earth use to find planets outside the solar system, because they orbit their host stars and produce tiny spots of light in the light we can see with astronomical instruments.

In June, Kaltenegger and Faherty announced their natural With an extensive list of stars, these stars have or will have the right direction to discover our planet. They identified more than 2,000 stars, and the time span ranges from 5,000 years ago when civilization on Earth first began to prosper to 5,000 years in the future.not only Learn By determining which stars they should focus on providing resources for exoplanet hunters, it also provides a unique — arguably disturbing — view of our visibility into the rest of the universe. “I feel a bit under surveillance,” Faherty said, remembering the incredible feeling of overexposure. “Do I want to stay on a planet that can be discovered?”

Bruce Macintosh, an astronomer at Stanford University who was not involved in this work, said: “In this elaborate ballet, thinking about the way all these objects move in space, this is a song Lovely scientific poetry.” As the first study of its kind to consider the vantage points of stars over time, it is based on previous studies using only their current position in the universe. “We can now build movies about what the universe will look like 5000 years from now, imagine all stars blinking as the planets block them,” he said.

The new results were made possible thanks to the release of the latest data from the European Space Agency’s Gaia mission, an orbiting observatory whose ambitious goal is to create a three-dimensional map of the positions and velocities of billions of stars. Combined with Faherty’s planetarium software to visualize the motion of stars, she and Kaltenegger discovered 2,034 stars in the transition zone of the Earth. For almost everyone, any extraterrestrial creatures living on planets orbiting these stars, if the technology is mature enough, can detect the existence of the earth for at least a thousand years. “On the cosmic time scale, this is a flash in the pan on the radar,” Kaltenegger said.

But she said that for human life, astronomers have enough time to develop the tools needed to observe other worlds. Kaltenegger and Faherty hope that astronomers can use the catalog to find new planets, especially around lesser-known or under-studied stars.From there, large-scale missions like NASA The future James Webb Space TelescopeIt will be launched at the end of this year and can be used to study planetary atmospheres and find signs of life. “This is a treasure trove of planets waiting to be discovered,” Kaltenegger said. “I am looking forward to people’s discovery.”

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