Europa's Core May Not Be Fully Formed, Study Finds.

A new study suggests that Jupiter's ocean moon, Europa, may not have a fully formed metallic core, if it has one at all. Europa's icy shell covers a saltwater ocean that may possess more liquid water than Earth. The formation of a metallic core would help make Europa more habitable, but it may have formed billions of years after the rest of the moon did. NASA's planned Europa Clipper mission may help scan the Jovian moon's gravity to improve our understanding of how mass is distributed inside Europa.