Astronomers have discovered an Earth-sized exoplanet, LP 791-18 d, believed to be highly volcanic. The planet's volcanic activity could sustain an atmosphere potentially allowing for water condensation on its cooler side. It orbits a small red dwarf star approximately 90 light-years away, sitting on
A paper about the planet – led by Merrin Peterson, a graduate of the Trottier Institute for Research on Exoplanets based at the University of Montreal – appears in the May 17 edition of the scientific journalIllustration of NASA’s Transiting Exoplanet Survey Satellite at work. Credit: NASA’s Goddard Space Flight Center
LP 791-18 d orbits a small red dwarf star about 90 light-years away in the southern constellation Crater. The team estimates it’s only slightly larger and more massive than Earth. Astronomers already knew about two other worlds in the system before this discovery, called LP 791-18 b and c. The inner planet b is about 20% bigger than Earth. The outer planet c is about 2.5 times Earth’s size and more than seven times its mass.
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