The newly-discovered planet has a radius of 1.03 Earth radii and a temperature between 27 and 127 degrees Celsius (81-261 degrees Fahrenheit), with the permanent night side plausibly allowing for water condensation. Named LP 791-18d, this so-called exo-Earth could undergo volcanic outbursts as often as Jupiter’s moon Io, the most volcanically active body in the Solar System.

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