8 Years from Now, NASA Will Send a Nuclear-Powered Helicopter Into Titan’s Atmosphere Where It Rains Methane

NASA's Dragonfly mission will send a nuclear-powered rotorcraft to Titan, Saturn's largest moon, where methane evaporates, methane clouds form, rain falls, rivers cut channels and liquids collect in lakes and seas. It is the only moon in the solar system with a substantial atmosphere and the only world besides Earth known to hold stable liquid on its surface.