kchangnyt

Yes, NASA is working on Europa Clipper: http://www.jpl.nasa.gov/missions/europa-clipper/ But that would just make multiple flybys of Europa, not land or tunnel into the water.

Yes, these are flowing oceans. On Ganymede, it's an ocean between two layers of ice. On Enceladus, it's water below an icy crust and on top of a rocky core.

I'd love to use metric. It'd save a slew of annoyances converting back and forth, and it's the easiest thing to screw up, because no one has an intuitive sense of a millionth of an inch. But as long as I work at the New York Times and New York is part of the United States and the United States isn't metric, I'm stuck with inches, miles, pounds and gallons.