EuHephaestian Subtype worlds

Also known as Ionian subtype

Image from Steve Bowers
Bunsu, a volcanically active Hephaestian world
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.
Io Habitat
Image from Steve Bowers
Io, a EuHephaestian world in Solsys
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Development Notes
Text by John M. Dollan in his Planet Classification List
Initially published on 10 November 2001.