NASA mission finds its first Earth-sized alien planet


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NASA’s Transiting Exoplanet Survey Satellite tv for pc (TESS) was launched to a lot fanfare in April 2018, because the $200 million spacecraft took over planet-hunting duties from its predecessor, the Kepler area telescope.

Seven months after discovering its first exoplanet, TESS has discovered its first Earth-sized planet.

“It’s so thrilling that TESS, which launched nearly a 12 months in the past, is already a game-changer within the planet-hunting enterprise,” the research’s co-author, Johanna Teske, of the Division of Terrestrial Magnetism (DTM) on the Carnegie Establishment for Science, mentioned in a press release. “The spacecraft surveys the sky and we collaborate with the TESS follow-up neighborhood to flag doubtlessly fascinating targets for added observations utilizing ground-based telescopes and devices.”


Sadly, the newly discovered Earth-size world, identified as HD 21749c, doesn’t seem like a candidate to host life. It orbits its star roughly as soon as each eight days, seemingly making it too scorching to help life. The star, HD 21749, has roughly “80 % of the mass of our Solar and is discovered about 53 light-years distant from Earth,” researchers added within the assertion.

Artist’s conception of HD 21749c, the primary Earth-sized planet discovered by NASA’s Transiting Exoplanets Survey Satellite tv for pc (TESS), in addition to its sibling, HD 21749b, a heat sub-Neptune-sized world. (Credit score: Robin Dienel, courtesy of the Carnegie Establishment for Science.)

“Measuring the precise mass and composition of such a small planet might be difficult, however vital for evaluating HD 21749c to Earth,” mentioned Wang. “Carnegie’s PFS group is constant to gather information on this object with this objective in thoughts.”

Although HD 21749c doesn’t seem like a candidate to host life, there’s hope that TESS will discover planets which will have circumstances to help life, mentioned the research’s lead writer, Diana Dragomir.

“For stars which might be very shut by and really brilliant, we anticipated to seek out up to some dozen Earth-sized planets,” Dragomir mentioned within the assertion. “And right here we’re — this is able to be our first one, and it’s a milestone for TESS. It units the trail for locating smaller planets round even smaller stars, and people planets could doubtlessly be liveable.”


The findings have been revealed within the scientific journal The Astrophysical Journal Letters.

A “heat sub-Neptune-sized world,” often known as HD 21749b, which takes 36 days to orbit HD 21749 and was beforehand found in January, was additionally talked about within the research.

TESS revealed its first pictures in September, turning into the next-generation craft to search for exoplanets, following Kepler, which found greater than 2,600 confirmed planets throughout its lifespan, in line with

TESS’ background

NASA’s astrophysics director, Paul Hertz, mentioned missions like TESS will assist reply whether or not we’re alone — or simply fortunate sufficient to have “one of the best prime actual property within the galaxy.”

The exoplanet rely, from all observatories in area and on Earth over the previous couple of a long time, stands at greater than three,700 confirmed with four,500 on the robust contender checklist.

About 50 are believed to doubtlessly liveable. They’ve the fitting dimension and the fitting orbit of their star to help floor water and, at the least theoretically, to help life.

Scientists speculate that the liveable or so-called Goldilocks zone — the space from a star the place it is neither too scorching nor too chilly to help life, however excellent with the potential for liquid water on the floor — must be a lot nearer to pink dwarfs than it’s in our personal photo voltaic system. The orbits of any planets in these techniques must be pretty quick.

NASA and others stress that TESS is not going to search for atmospheric or different indicators of life; it will probably’t try this.

That each one-important job might be left to the James Webb Telescope, the next-generation successor to the Hubble Area Telescope that is grounded till at the least 2020.


Fox Information’ James Rogers and The Related Press contributed to this report. 

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