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Six images of the mini-jets taken by Cassini between 2005 and 2008. Credit: NASA/JPL-Caltech/SSI/QMUL Objects half a mile in diameter have been spotted punching through Saturn’s outermost ring, the F ring, and leaving glittering trails as they drag icy particles behind them. Scientists are calling these trails mini-jets.

Within our solar system , an extra giant planet, or possibly two, might once have accompanied Jupiter, Saturn, Neptune and Uranus. [More]

Jupiter, Saturn, Uranus and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth

Two remarkable pulsed-power machines used to test the nation’s defenses against atomic weapons have surpassed milestones at Sandia National Laboratories: 4,000 firings, called ‘shots,’ on the Saturn accelerator and 9,000 shots on the HERMES III accelerator.

Enceladus, a small satellite of Saturn, has captivated planetary scientists for years with its watery polar geysers and ridgelike surface features known as "tiger stripes." Now it has a new layer of intrigue. The gas and ice escaping from Enceladus and shooting out from the moon's south pole in towering jets, which fill Saturn's diffuse E ring, also seem to rain down on Saturn itself, providing water vapor to the giant planet's upper atmosphere

A NASA spacecraft that in 2005 discovered watery plumes spewing from the surface of Saturn's icy moon Enceladus has now found compelling evidence that the plumes stem from an underground reservoir of saltwater. [More]

Titan, Saturn's largest moon, has numerous lakes and seas. But they're not bodies of water--Titan's reservoirs are full of liquid hydrocarbons such as methane.