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Could There Be Life On The First Earth-Sized, Habitable Zone Planet Found By NASA's TESS? - Forbes

NASA's Goddard Space Flight Center/Chris Smith (USRA)

Announced on January 6, 2020, NASA's TESS mission has just discovered its first Earth-sized, habitable zone planet.

NASA/Kepler Mission/Dana Berry

If it has an Earth-like atmosphere, it could possess liquid water on its surface.

NASA/MIT/TESS

TESS works by surveying different slivers of the sky one month at a time in succession.

NASA

The polar areas receive the greatest coverage, and include the region where the star TOI 700 is located.

NASA's Goddard Space Flight Center/Chris Smith (USRA)

Appearing in 11 independently viewed TESS sectors, TOI 700 possesses at least 3 planets orbiting it.

NASA/Solar Dynamics Observatory (SDO) via Getty Images

Although TOI 700 is an M-class red dwarf, it exhibits no flaring, benefitting potential lifeforms.

NASA's Goddard Space Flight Center/Chris Smith (USRA)

The third planet from the star  TOI 700d  is only 19% larger than Earth, receiving 86% of the incident energy on Earth.

Chen and Kipping, 2016, via https://arxiv.org/pdf/1603.08614v2.pdf

Even though the planet is likely to be tidally locked, with the same face always towards its star, it's still potentially habitable.

NASA/JPL-Caltech

Everything depends on the composition of the atmosphere and how energy flows around the world.

Engelmann-Suissa et al./NASA's Goddard Space Flight Center

A CO2-heavy atmosphere creates a uniformly hot world, where life is strongly disfavored.

Engelmann-Suissa et al./NASA's Goddard Space Flight Center

For contrast, a cloudless, oceanless world with an Earth-like atmosphere possess sunward-directed winds and various temperature zones.

Matt Mountain / AURA

Technologies beyond James Webb will be required to determine its true composition.


Mostly Mute Monday tells an astronomical story in images, visuals, and no more than 200 words. Talk less; smile more.

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