The heat from Saturn may allow the moon's icy surface to melt slightly ... It is a small, potato-shaped moon with a spongy-looking texture. Scientists suggest that Hyperion's odd shape is ...

There is no surface below. Saturn's made almost entirely of hydrogen and helium gas, which is why it's called a gas giant. 4,000 kilometers above the surface, we hit Saturn's upper atmosphere.

Titan may seem like a prime candidate for alien life with its organic-rich surface and deep subsurface ocean, but new ...