It seems intuitive that an opaque material should contain more stuff than a more translucent substance. For example, muddier water has more suspended particles of dirt in it than clearer water.

With its beautiful rings, Saturn may be the most stunning planet in the solar system. It is the sixth planet from the sun and the second-largest planet in the solar system, after Jupiter. Though ...

Enceladus, a small icy moon of Saturn, may have dramatically reoriented relative to its axis of rotation, rolling over to put an area of low density at the moon’s south pole. According to a new study, ...