It looks like the "Death Star" — but Saturn's tiny frozen moon could actually be a "stealth" ocean world, scientists say

One of NASA's latest discoveries could change the definition of what planetary objects aside from Earth will be considered "potentially habitable." Researchers have found that Saturn's tiny, frozen "Death Star" moon, called Mimas, could actually be a "stealth" ocean world.   

Researchers explained their findings about Mimas in a study published in the journal Icarus this month. The study stems from information collected during the last days of NASA's 20-year Cassini mission, which ended in September 2017. The Cassini spacecraft made a final plunge into Saturn's atmosphere, where it was "crushed and vaporized" by the planet's forces, according to NASA.

Southwest Research Institute geophysics specialist Alyssa Rhoden, who is co-leader of NASA's Ocean World's Research Coordination Network, had been trying to prove that Mimas was a frozen inert satellite when she found evidence of an existing ocean.