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The Cassini space probe has captured an incredible image of Saturn's tiny moon Mimas, suspended against the colourful backdrop of the ringed planet.


 Moon Saturn Mimas ring
Saturn's vast and majestic ring system has its own atmosphere - separate from that of the planet itself, according to data from the Cassini spacecraft. And Saturn is rotating seven minutes more slowly than when probes measured its spin in the 70s and 80s - an observation experts cannot yet explain.


 atmosphere Cassini Saturn ring
The dusty hoop lies some 13 million km (eight million miles) from the planet, about 50 times more distant than the other rings and in a different plane. ... Indeed, so feeble is the ring that scientists have calculated that if all the material were gathered up, it would fill a crater on Phoebe no more than a kilometre across.


 Saturn ring astronomy Solar System Iapetus Moon Phoebe
In biology, a ring species is a connected series of neighboring populations that can interbreed with relatively closely related populations, but for which there exist at least two "end" populations in the series that are too distantly related to interbreed. Often such non-breeding-though-genetically-connected populations co-exist in the same region thus creating a "ring". Ring species provide important evidence of...
 evolution biology species interbreeding ring compatibility
The mountainous ridge that circles the equator on the Saturnian moon Iapetus is both weird and spectacular. Discovered in 2004, the icy rim is as much as 20km high and runs fully 1,600km from end to end. No explanation for its existence has yet won total support; it is a puzzle.


 Iapetus Moon Saturn ridge ring equator geology mountains astronomy