NASA finds captivating ocean world is making oxygen. Here's how much.

NASA suspects that the ice-clad moon Europa harbors a deep, deep sea — reaching some 40 to 100 miles (60 to 150 kilometers) down. And new evidence, from the space agency's Juno craft, points to surface processes that create bounties of oxygen on Europa, some of which is transported into the world's voluminous ocean. It's not as much oxygen as some research has previously suggested, but it's nothing to sneeze at:"The ice-covered Jovian moon generates 1,000 tons of oxygen every 24 hours &nda