Cassini Spacecraft Image Shows the Difference between Janus and Tethys

This image from the Cassini Spacecraft demonstrates the main difference between small moons and large ones. It’s all about the moon’s shape. Moons like Tethys (660 miles or 1,062 kilometers across) are large enough that their own gravity is sufficient to overcome the material strength of the substances they are made of (mostly ice in […]
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