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Saturn's moons Janus and Epimetheus

Saturn's moons Janus and Epimetheus

C037/2367

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Credit

NASA / JPL / SPACE SCIENCE INSTITUTE / SCIENCE PHOTO LIBRARY NASA / JPL / SPACE SCIENCE INSTITUTE / SCIENCE PHOTO LIBRARY

Caption

Cassini spacecraft image of Saturn's moons Janus (right) and Epimetheus (left) and the planet's F ring (far left). These two moons effectively share the same orbit, as the difference in their distances from Saturn, is less than the radius of either moon. This configurations causes the moons to swap orbits every four years with the outermost becoming the innermost and vice versa. Saturn's F ring is a narrow ring towards the outer edge of the ring system. The rings are made of chunks of rock and water ice. Image obtained by Cassini's narrow-angle camera on 8th September 2005 at a distance of approximately 1.8 million kilometres from Janus and 1.7 million kilometres from Epimetheus.

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