The planet, which does not rotate, may also hold water, researchers said. One side of the planet is too hot, but the other side remains in permanent night, which scientists said could 'plausibly' allow for water condensation.
The researchers' observations suggest that the planet is rugged and rocky, with constant eruptions from volcanoes on the surface. Scientists didn't directly see the volcanoes, but instead used observations of the way the planet interacts with one of the other larger planets orbiting the same dim star. The larger planet has a strong gravitational tug, which may cause the newer, smaller one to squeeze and flex, heating the interior and causing volcanic activity on the surface.
LP 791-18 d, shown here in an artist's concept, is an Earth-size world about 90 light-years away. One of the larger, nearby planets is shown as a blue disc in the background. / Credit: NASA's Goddard Space Flight Center/Chris Smith The planet, which does not rotate, may also hold water, researchers said. One side of the planet is too hot, but the other side remains in permanent night, which scientists said could "plausibly" allow for water condensation.
"LP 791-18 d is tidally locked, which means the same side constantly faces its star," Björn Benneke, a co-author and astronomy professor at the University of Montreal's the Trottier Institute for Research on Exoplanets who planned and supervised the study,. "The day side would probably be too hot for liquid water to exist on the surface.
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