The study says that some exoplanets can keep the Earth in sight



“In our exploration of life in the universe, we ask a different question in this research,” said Lisa Kultenegger, associate professor of astronomy at Cornell University’s College of Arts and Sciences and director of Cornell’s Carlson Institute, shared by the institution Gone video

“We ask, who can really see us? Who can find out that the Earth is dealing with life from its point of origin?”

Kultenegger and Joshua Pepper, an associate professor of physics at the University of Leh, have identified more than a thousand stars, similar to our sun, that can orbit Earth-like planets at distances from stars where they support liquid water on their surfaces can do. This distance has been referred by astronomers as habitable zones.

To be clear, such planets have not yet been detected or confirmed around these stars.

And those potential planets, which are within 300 light years from Earth, can have a direct view of the Earth and the life that thrives on it.

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“It takes a specific place to be able to move the Earth in front of its star, the Sun. And then once a year, if you see the Earth going in front of the Sun from your point of view, the Sun will be.” Just a little less bright, ‚ÄĚKultinager said.

“And so you will know that a planet orbits it. And you also know that it is at the right distance, so it can contain liquid water, which is an important element for life.

“So we identified the thousand closest stars within 300 light-years, roughly, that could already see us. Maybe there is life in the universe. Maybe they’ve already seen us. What would they think ? ”

If life exists outside of the Earth and is within our eyesight, they can use sunlight as the Earth passes through it to see our atmosphere and understand more about our planet.

This image of the earth, dubbed & quot;  Pale Blue Dot, & quot;  First & quot;  Portrait & quot;  Is a part of the solar system taken by Vyzer 1.
“If observers were searching, they could see signs of a biosphere in the atmosphere of our pale blue dot,” he said, “and we can also see some of these stars in our night sky with binoculars.” ” Or binoculars. “

The “pale blue dot” is the name of an iconic image suggested by Cornell astronomer Carl Sagan that NASA’s Voiger 1 probe is 3.7 billion miles from Earth as the probe moved to the edge of the solar system. The image was taken on February 14, 1990.

The pursuit of life

The observation of the passing of a planet in front of its host star is called a transit, and is one of the main methods used by astronomers to detect exoplanets using ground and space-based telescopes.

When NASA’s James Webb Space Telescope launches next year, it will be used to peer into Exoplanet’s atmosphere using this method, and astronomers can use that data to help characterize Exclonet’s atmosphere.

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And NASA’s planet-hunting Transiting Exoplanet Survey Satellite (TESS) mission, which has been observing the closest stars since its launch in 2018, will begin a new phase of its mission in 2021. The mission will search for eclipses in eclipseletic, the plane of the Earth’s orbit around the Sun. The TES spacecraft will inevitably turn to look at the sky further.

The list of stars compiled by the researchers, which was created from TESS’s star catalog, can be used as a target for the discovery of exoplanets.

The TESS mission spots Earth-sized potentially habitable planets and & # 39;  Tatooine & # 39;  system

Ecliptic is also essentially the place where there are exoplanets whose vision is on Earth because from their vantage point, they can see the Earth as it crosses in front of the Sun.

“Only a very small fraction of the exoplanet will have to align randomly with our line of sight so that we can see them transit,” Pepper said.

Star systems that could see Earth when life began on our planet are different from those that can now see signs of life on our planet – as well as star systems that can see Earth in the future, The researchers wrote in their paper.

“If we find a planet with a vibrant biosphere, we’ll be curious about whether anyone is looking at us as well,” Kultenegger said. “If we are looking for intelligent life in the universe, he can find us and wants to stay in touch, we have just created the star map where we should first look.”

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