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Water-Ice Geysers At least 30 separate water-ice geysers shoot from the moon Enceladus in this image. After discovering this remarkable activity in 2005, Cassini flew through the plumes and found them full of life-friendly molecules. “Our discovery of salty liquid water bathed in heat and suffused with organic compounds under the south pole of Enceladus is, the most exciting discovery that has ever been made in our solar system,” Porco says. “It’s a habitable zone, and it’s accessible.”

NGC 7662 "Blue Snowball", a planetary nebula in the nearby galaxy, Andromeda, about 5,600 light years distant.

How old are Saturn's rings? No one is quite sure. One possibility is that the rings formed relatively recently in our Solar System's history, perhaps only about 100 million years ago when a moon-sized object broke up near Saturn. Evidence for a young ring age includes a basic stability analysis for rings, and the fact that the rings are so bright and relatively unaffected by numerous small dark meteor impacts.

Visualization of the Moon and Sun

This is an image of a lunar eclipse as viewed by NASA's Solar Dynamics Observatory, or SDO, with a model of the moon from NASA's Lunar Reconnaissance Orbiter replacing the lunar shadow.

When the Voyager 1 and 2 spacecraft flew by Saturn in 1980 and 1981, they were able to pay only fleeting attention to Titan, the second largest moon in the solar system (larger even than the planet Mercury) and the only solar system moon with an appreciable atmosphere. These images are from subsequent Titan flybys in 2005 and 2006. - Image credit: NASA / JPL / University of Arizona

Neptune and its dark spot - has the fastest winds of any other planet and is almost completely made up of gases, the rest is made up of rock and ice.

Jupiter and Galileian moons to scale. Callisto image from Voyager 2, other from Galileo mission.

The crescent planet Neptune and its crescent moon Triton, as seen by NASA's Voyager 2 spacecraft in 1989.