Ancient Ceres may have had plenty of ice volcanoes
 

Millions of years ago, Ceres' surface might have had plenty of icy volcanoes to keep Ahuna Mons company. Scientists have always found its solitary existence weird anyway. "Imagine if there was just one volcano on all of Earth," University of Arizona...

https://www.engadget.com/2017/02/05/...ice-volcanoes/