News and commentary about the Great Frontiers

ISS007-E-10807 (21 July 2003) --- This view of Earth's horizon as the sunsets over the Pacific Ocean was taken by an Expedition 7 crewmember onboard the International Space Station (ISS). Anvil tops of thunderclouds are also visible. Credit: Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Image Credit: ISS007-E-10807 (21 July 2003) – Earth Science and Remote Sensing Unit, NASA Johnson Space Center

A Tour of the Moons of Saturn – Epimetheus

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The tiny and irregular shaped Epimetheus orbits Saturn with a similar moon called Janus, both of which may have formed when a larger body was broken up during a collision earlier in its history. Because the density of Epimetheus is less than that of water, it may be porous, perhaps just a pile of rubble held weakly together by gravity.

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