On Earth, the heat generated from the radioactive decay of elements in Earth’s mantle drives convection currents, pushing and dragging large plates of Earth’s crust around.

more…

Astronomers May Have Found The First Evidence For Tectonic Activity On An Exoplanet

This artist’s illustration represents the possible interior dynamics of the super-Earth exoplanet LHS 3844b. Thibaut Roger/University of Bern

Does that include interior lightning?

Tau.Neutrino said:

This artist’s illustration represents the possible interior dynamics of the super-Earth exoplanet LHS 3844b. Thibaut Roger/University of Bern

Does that include interior lightning?

https://www.sciencealert.com/astronomers-have-found-the-first-evidence-for-tectonic-activity-on-an-exoplanet

OK, based on a rocky planet without atmosphere in close orbit and thus tidally locked to its star.

“That leaves half of LHS 3844b permanently exposed to its sun and could mean temperatures of up to roughly 800 degrees Celsius on the day side, and about minus 250 degrees Celsius on the night side.”

“Most of the simulations the researchers ran showed only upwards flow on one side of the planet and only downwards flow on the other”.

“LHS 3844b could have one entire hemisphere covered in volcanoes, while the other side shows hardly any volcanic activity – all because of the intense temperature contrast around the planet.”