Astronomers Say Aliens May Already Know of Humans

25 Octobre, 2020, 14:25 | Auteur: Therese Cote
  • Alien Planets Around 1,000 Nearby Stars Could Be Looking Straight Back at Earth

To be clear, no such planets have ever been discovered or confirmed about these stars.

"Let's reverse the viewpoint to that of other stars and ask from which vantage point other observers could find Earth as a transiting planet".

Lisa Kaltenegger, the director of Cornell's Carl Sagan Institute and the study's co-author, notes that for this study, she and Lehigh University astronomer Joshua Pepper chose to "reverse the viewpoint and ask from which systems other observers could see Earth as a transiting planet".

Kaltenekar and Joshua Pepper, associate professors of physics at the University of Leh, have identified more than a thousand stars, such as our Sun, which orbit like Earth, which may support liquid water on their surface.

And these potential planets, all located 300 light-years away from Earth, could have a direct view of Earth and the life thriving on it. Maybe there's life out there in the universe. In the even that there's anybody up there, they can see us.

"If observers were looking there, they would be able to see signs of the biosphere in our pale blue dot atmosphere, and we could even see some of these brightest stars in the night sky without binoculars or telescopes", she said.

Passing a planet in front of its host star is called a transport, and it is one of the main methods used by astronomers to detect exoplanets using terrestrial and space-based telescopes.

Scientists Say Aliens May Have Already Spotted Humans; Here's How

This work was funded by the Carl Sagan Institute and the Breakthrough Initiative.

American astronomers compiled a list of star systems that they could use to see the earth and determine life on it.

Transit observations are a crucial tool for Earth's astronomers to characterize inhabited extrasolar planets, Kaltenegger said, which astronomers will start to use with the launch of NASA's James Webb Space telescope next year. Holding the key to this science is Earth's ecliptic - the plane of Earth's orbit around the Sun. Missions like NASA's Kepler and TESS have succeeded in discovering several exoplanets that are located in the habitable zone of their star system. To spot Earth, astronomers on these exoplanets would need to utilize similar methods we do to index a removed item: looking as Earth passes before the Sun to sort out the cosmetics of our planet's atmosphere, known as a travel perception. "We have created a star map of where we should look first".

The team has identified 1,004 stars along the line in their eyes, which may contain habitable, Earth-like planets.

"Only a very small portion of the exoplanets will be roughly aligned with our vision, so we can see their traffic", Pepper said.

"If we see a planet with a vibrant biosphere, we will be curious about whether anyone sees us or not", Kaldenegar said.

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