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  >  Exploring the Solar System

Lonely, Lumpy Janus

Posted on Monday, October 28, 2013
Uploaded by Waspie_Dwarf
Lonely, Lumpy Janus
Image credit: NASA/JPL-Caltech/Space Science Institute

Uploader comment: The irregularly shaped moon Janus keeps up its lonely orbit. Even though Janus shares its orbit with the moon Epimetheus, they never get very close to one another thanks to the gravitational resonance that swaps their orbits roughly every four years and ensures that they don't collide.


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