Caption: 
In the icy bodies around our solar system, radiation emitted from rocky cores could break up water molecules and support hydrogen-eating microbes. A University of Texas at San Antonio (UTSA) and Southwest Research Institute (SwRI) team modeled a natural water-cracking process called radiolysis and applied the model to Europa (pictured) and several other worlds with known or suspected interior oceans.

Credit: 
Image Courtesy of NASA/JPL-Caltech/SETI Institute