Astronomers Have Found The First Evidence For Tectonic Activity on an Exoplanet 6 MARCH 2021 You may not be all that familiar with planet LHS 3844b, but it now has its own particular distinction: It's the first planet outside of our Solar System where astronomers think they might have evidence of tectonic activity.
That evidence is a set of advanced simulations based on observations of the rocky planet, which is slightly larger than Earth. Importantly for this particular piece of research, it doesn't look as though the exoplanet has an atmosphere. That leaves half of LHS 3844b permanently exposed to its sun and could mean temperatures of up to roughly 800 degrees Celsius (1,472 degrees Fahrenheit) on the 'daytime' side, and about minus 250 degrees Celsius (minus 418 degrees Fahrenheit) on the 'night-time' side.