NASA Spacecraft Poised to Find Thousands of Alien Worlds

But will we find another Earth?

Within just 50 light-years from Earth, there are about 1,560 stars, likely orbited by several thousand planets. About a thousand of these extrasolar planets — known as exoplanets — may be rocky and have a composition similar to Earth's. Some

By Daniel Apai www.livescience.com 11-6-19

may even harbor life. Over 99% of these alien worlds remain undiscovered — but this is about to change.

With NASA's new exoplanet-hunter space telescope TESS, the all-sky search is on for possibly habitable planets close to our solar system. TESS — orbiting Earth every 13.7 days — and ground-based telescopes are poised to find hundreds of planets over the next few years. This could transform astronomers' understanding of alien worlds around us and provide targets to scan with next-generation telescopes for signatures of life.

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New Satellite Will Scan the Cosmos for Alien Worlds

Illustration of the Transiting Exoplanet Survey Satellite (TESS). The satellite will identify thousands of potential new planets for further study and observation.GSFC / NASA

With help from NASA’s Kepler planet-hunting spacecraft, astronomers have identified more than 2,000 planets beyond our solar system over the past decade. Now the space agency is sending up a new satellite that promises to be even better at

By Denise Chow NBC News 4-13-18

sniffing out alien worlds — with the hope that we may finally be able to find one that harbors extraterrestrial life.

The Transiting Exoplanet Survey Satellite (TESS) is scheduled to lift off from the Cape Canaveral Air Force Station in Florida on Monday, April 16, at 6:32 p.m. EDT.

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The Drake Equation Revisited: Interview with Planet Hunter Sara Seager

By Devin Powell
Astrobiology Magazine / www.space.com
9-4-13

". . . two inhabited planets could reasonably turn up during the next decade"

      Planet hunters keep finding distant worlds that bear a resemblance to Earth. Some of the thousands of exoplanet candidates discovered to date have similar sizes or temperatures. Others possess rocky surfaces and support atmospheres. But no world has yet provided an unambiguous sign of the characteristic that still sets our pale blue dot apart: the presence of life.

That may be about to change, says exoplanet expert Sara Seager of the Massachusetts Institute of Technology in Cambridge. Upcoming NASA missions such as the Transiting Exoplanet Satellite Survey (TESS) and the James Webb Space Telescope, both due to launch around 2018, should be able to find and characterize Earth-like planets orbiting small stars.

Spotting signs of life on those planets will be possible because of progress in detecting not only planets, but their atmospheres as well. When a planet passes in front of its host star, atmospheric gases reveal their presence by absorbing some of the starlight. Oxygen, water vapor or other gases that do not belong on dead worlds could very well provide the first evidence of life elsewhere. . . .

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