Researchers have just revealed that Mimas, one of Saturn's smallest moons, has an ocean of liquid water flowing under its entire surface. What is really making waves though, is how young the body of water is: just 5 to 15 million years old.

KB: We asked ourselves, "what obliquity, what misalignment would Planet Nine induce in the solar system?" because it must induce some. We know that Planet Nine's orbit in inclined. As a result, when Planet Nine torques the rest of the solar system, the two sort of act as two precessing tops.

We're going to Titan, and we're going in style. NASA announced on Thursday its next great solar system exploration mission. "Dragonfly" involves an ambitious plan to send a rotorcraft -- essentially a large drone -- to Saturn's moon, Titan.