Volcanic activity on the alien world, which lies about 90 light-years from Earth, may generate an atmosphere.
, which was shut down mainly to free up resources for NASA's James Webb Space Telescope.)
LP 791-18 d is the third planet found in this particular star system, along with LP 791-18 b and c. Planet b, the innermost of the three, is about 20% larger than Earth. Planet d, the outermost world, is about 2.5 times wider than Earth and at least seven times more massive, team members said. Planets c and d pass relatively close to each other during their orbits around the red dwarf host star. These interactions have significant consequences for the newfound exoplanet.
"Each close pass by the more massive planet c produces a gravitational tug on planet d, making its orbit somewhat elliptical," NASA officials said in the same statement. "On this elliptical path, planet d is slightly deformed every time it goes around the star," they added."These deformations can create enough internal friction to substantially heat the planet's interior and produce volcanic activity at its surface.
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