NASA’s TESS Exoplanet Mission Finds 1st Earth-Size Alien World

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The Transiting Exoplanet Survey Satellite (TESS) spotted the planet, as well as a weird “sub-Neptune” world, circling the star HD 21749, which lies about 53 light-years from Earth, a new study reports.

“It’s so exciting that TESS, which launched just about a year ago, is already a game-changer in the planet-hunting business,” study co-author Johanna Teske, of the Department of Terrestrial Magnetism (DTM) at the Carnegie Institution for Science in Washington, D.C., said in a statement.

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TESS soared to Earth orbit in April 2018 atop a SpaceX Falcon 9 rocket to hunt for planets around some of the closest and brightest stars in the sky. This work involves looking for the tiny brightness dips that occur when alien worlds cross their host stars’ faces from the spacecraft’s perspective.

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Nasa space telescope finds its first Earth

Nasa’s Transiting Exoplanet Survey Satellite (Tess) aims to find at least 50 small rocky planets during its two-year mission.

Scientists have announced its first success ‘ a planet named’HD 21749c which is about the size of the Earth and orbits a star 52 light years away.

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Dr Diana Dragomir, from Massachusetts Institute of Technology’s Kavli Institute for’Astrophysics and Space Research, said:’For stars that are very close by and very bright, we expected to find up to a couple of dozen Earth-sized planets.’And here we are ‘ this would be our first one, and it’s a milestone for Tess.’It sets the path for finding smaller planets around even smaller stars, and those planets may potentially be habitable.’

NASA’s New Planet-Hunter Finds Its First Earth

Artist’s conception of HD 21749c, the first Earth-sized planet found by NASA’s Transiting Exoplanets Survey Satellite (TESS), as well as its sibling, HD 21749b, a warm sub-Neptune-sized world.

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Orbiting the K dwarf star HD 21749, the astronomers found HD 21749c, which takes about eight days to orbit the host star and is similar in size to Earth at 89% its diameter. Videos for NASA's TESS Exoplanet Mission Finds 1st 2:18NASA's TESS Finds 21 New Worlds in 1st YearYouTube A likely rocky world, it’s thought to have surface temperatures as high as 800°F /427°C. They also found HD 21749b, a warm sub-Neptune-sized world about 23 times Earth’s mass and a radius of about 2.7 times Earth’s, which orbits its host star every 36 days. That one was a bit of a surprise since TESS is not designed to detect planets that take longer than 10 days to orbit their star.

  • Publisher: Forbes
  • Date: 2019-04-15
  • Author: Jamie Carter
  • Twitter: @forbes
  • Citation: Web link (Read More)

NASA’s planet-hunting mission makes incredible discovery

NASA’s planet-hunting’TESS mission’has only been surveying the sky since July, but it’s already making incredible discoveries.

In January,’three exoplanet discoveries’were connected to the initial observations from TESS. Now, data collected by TESS has determined a new Saturn-size planet.

TOI (TESS Object of Interest) 197.01 is considered to be a “hot Saturn” – It’s similar in size to that planet and orbits its host star at a close distance, circling it every 14 days, which creates a high surface temperature on the planet.

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Asteroseismologists discovered the planet by studying seismic waves called starquakes in stars where the brightness appears to shift.

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