Nitrogen and methane extend around the moon 10 times as far into space as Earth's atmosphere, sometimes falling to Titan's surface as methane rain. Rhea is a heavily cratered moon composed of ice ...

You thought Saturn's 146 moons were impressive? Think again. The ringed planet's moon count has nearly doubled with the ...

In this case, the king of the fairies from A Midsummer Night’s Dream. Rhea is Saturn’s second-largest moon, discovered way back in 1672 by astronomer Giovanni Cassini. It’s mostly made of ...

Saturn's moon Rhea looms over a smaller and more distant Epimetheus against a striking background of planet and rings. The two moons aren't actually close to each other. Photograph by NASA/JPL ...