Is 1/4th of Rhea frozen ammonia?
SATURN'S RINGS GAVE BIRTH TO MOONS
(Space & Astronomy News, 22/12/05)
Saturn's moons formed from gas rings circling the planet, an Australian
scientist says. And he has dubbed Saturn's second largest moon, named Rhea,
the "ammonia moon", saying it is one quarter frozen ammonia.
http://www.abc.net.au/science/news/space/S...ish_1533866.htm
