Cassini Scientists Rethinking Titan
NASA and the European Space Agency became fascinated with
Saturn's moon, Titan, after analyzing the data from Voyager's flyby
in 1980 and 1981. That's when they discovered the moon's dense
atmosphere, made mostly of methane. Why, they wondered, at
temperatures prevalent on Titan, doesn't the methane fall from the
sky like rain? Perhaps there was a ocean of methane on the
surface.