EuHephaestian Subtype worlds
These worlds are geologically active due to varying degrees of tidal flexing, caused by other planets or moons orbiting the same primary. Often these worlds are so active that their surface morphology changes significantly within a century.
Also known as Ionian subtype
|Io, a EuHephaestian world in Solsys|
Text by John M. Dollan in his Planet Classification List
Initially published on 10 November 2001.