This is interesting although apparently the new image taken last month isnt unusual
August 2009
July 2004
Quote:
Originally Posted by NASA
These figures show the four propeller-shaped structures discovered in close-up images of Saturn’s A ring.
The propellers are about 5 kilometers (3 miles) long from tip to tip, and the radial offset (the "leading" dash is slightly closer to Saturn) is about 300 meters (1000 feet).
The figures were cropped from two original Cassini spacecraft narrow angle camera images (taken during Saturn orbit insertion on July 1, 2004) and magnified for visibility. The images were then reprojected so that orbital motion is to the left, and Saturn is up. The unseen moonlets lie in the center of each structure.
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Quote:
Originally Posted by NASA
It has since become a growing realization resulting from Cassini's exploration of Saturn that the objects forming Saturn's rings very likely span the full spectrum of sizes, from the smallest dust-sized ring particles to the ring-moons like Daphnis and 29-kilometer-wide Pan -- a significant advance in divining the origin of Saturn's rings.
The novel illumination geometry that accompanies equinox lowers the sun's angle to the ringplane, significantly darkens the rings, and causes out-of-plane structures to cast long shadows across the rings. (The rings have been brightened in this image to enhance visibility.) These scenes are possible only during the few months before and after Saturn's equinox which occurs only once in about 15 Earth years.
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Or it's the Annunaki