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Astronomy Picture of the Day
2008 February 11
Saturn's Moon Epimetheus from the Cassini Spacecraft
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: How did Epimetheus form? No one is yet sure. To help answer that question, this small moon has recently been imaged again in great detail by the robot spacecraft Cassini now orbiting Saturn. Epimetheus sometimes orbits Saturn in front of Janus, another small satellite, but sometimes behind. The above image, taken last December, shows a surface covered with craters indicating great age. Epimetheus spans about 115 kilometers across. Epimetheus does not have enough surface gravity to restructure itself into a sphere. The flattened face of Epimetheus shown above might have been created by a single large impact.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC
& Michigan Tech. U.

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current09:50, October 17, 2013Thumbnail for version as of 09:50, October 17, 2013600 × 580 (153 KB)Jcpag2010 (wall | contribs)Source: Google

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