Some exoplanets may also be able to see us

Sincerely: CC0 Public Domain

Cornell astronomer Carl Sagan reported three decades later that the Weezer photographed Earth from 1 billion miles away – resulting in the iconic Pale Blue Dot photograph — two astronomers now providing a more unique cosmic perspective:

Some exoplanet-planets beyond our own solar system have a straight line to observe the biological properties of the Earth from far and wide.

Lisa Kultenegger, Associate Professor of Astronomy at the College of Arts and Sciences and director of Cornell’s Carl Sagan Institute; And Joshua Pepper, Associate Professor of Physics at Leh University, has identified 1,004 main-sequence stars (similar to our sun), which can have Earth-like planets in their own habitable zones – all around 300 of Earth’s Within light years and who should be able to detect the chemical traces of Earth’s life.

Paper, “Which stars can see the Earth as a transiting exoplanet?” Posted on October 21 in Monthly notice of the Royal Astronomical Society.

“Let us reverse the view of other stars and ask which vantage points other observers may find the Earth as a transit planet,” said Kultenegger. A transit planet is one that passes through the second star of the observer’s vision, such as the Sun, revealing clues as to the makeup of the planet’s atmosphere.

“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 “.

Cornell astronomer Lisa Kultenegger and Leah University’s Joshua Pepper have identified 1,004 main-sequence stars similar to our Sun – here within about 300 light years of their own habitable regions, there may be Earth-like planets, which are part of the Earth. Must be able to detect chemical traces of life. Sincerely: John Munson / Cornell University

Transit observations are an important tool for Earth’s astronomers to characterize inhabited extrasolar planets, said Kultenegger, which astronomers will begin using next year with the launch of NASA’s James Webb Space Telescope.

But which star systems can we find? Holding the key to this science is the eclipse of the Earth – the plane of the Earth’s orbit around the Sun. Ecliptic is where exoplanets with a view of the Earth will be located, as they will be able to see the Earth crossing their own sun – giving observers a way to discover the vibrant biosphere of our planet.

Pepper and Kaltenager listed the thousand closest stars using NASA’s Transiting Exoplanet Survey Satellite (TESS) star catalog.

“Only a very small fraction of exoplanets will have to align randomly with our line of sight so that we can see them.” Pepper said. “But the thousand stars we identified in our paper in the Solar Neighborhood could see our Earth crossing the Sun, calling our attention.”

“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” He said, “We have just made a star map of where we should look first.”

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more information:
L. Kalteniger, J. Papers. Which stars can see the Earth as a transit exoplanet? Monthly notice of Royal Astronomical Society: Letter, Volume 499, Issue 1, November 2020, Pages L111-L115, Published: October 20, 2020

Provided by Cornell University

Quotes: Smile, Wave: Some Exoplanets May Be Able to See Us, (2020, October 21) Retrieved October 21, 2020, from

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