If new findings from NASA researchers hold up, the Earth-sized exoplanet orbiting a star 90 light-years away from us is teeming with active volcanoes, all over its surface.
On a glance, LP 791-18 d probably seems like a violent place to live. Interesting geology, sure—but clearly this is no place suitable for life to thrive, right?, might not be a cozy place most for most of us, but the exoplanet, which orbits a small red dwarf star in the southern constellation Crater, may be more habitable than we think. And much of that may actually be due to the fact that it’s covered hundreds of volcanoes.
LP 791-18 d was found by NASA’s TESS and the recently retired Spitzer Space Telescope, in combination with data acquired by ground-based observatories around the world. The new paper shows that the planet is probably undergoing the same kind of volcanic outbursts that dot Jupiter’s moon Io, theThe planet is tidally locked, which means the same side is constantly facing the star it’s orbiting. One side of the planet is in perpetual daytime, while the other only knows the night.
But crucially, the volcanic activity that dots the planet means that LP 791-18 d could help build an atmosphere for the entire planet. An atmosphere could help water condense on the night side of the planet. And that means that life of some kind—probably microbial—could perhaps evolve and sustain itself. LP 791-18 d sits precisely in a distance from the star where liquid water could theoretically pool up on a planet.
To be clear, the volcanoes on the planet have not been confirmed, but there is some pretty good reason to believe they exist. LP 791-18 d actually has two sibling planets that also orbit the same star. One of these planets in particular passes close to LP 791-18 d and gravitationally tugs on it, causing slight geological deformations each time. Those deformations are enough to generate internal friction that heat up the planet’s interior and for volcanic activity to burst out of the surface.
More work will be needed to confirm what LP 791-18 d really looks like , but if the findings hold true, it could jump up as one of the most compelling exoplanet discoveries in recent memory.
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Yellowstone volcano super-eruptions appear to involve multiple explosive eventsHannah Osborne is the planet Earth and animals editor at Live Science. Prior to Live Science, she worked for several years at Newsweek as the science editor. Before this she was science editor at International Business Times U.K. Hannah holds a master's in journalism from Goldsmith's, University of London.
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