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Two companion moons share the sky before the Cassini spacecraft. Tethys is seen here with one of its two Trojan moons. Calypso, which trails the larger moon in its orbit by 60 degrees, is a couple of pixels across near lower right. Telesto (not pictured) is the other Tethys co-orbital moon, leading Tethys by 60 degrees. For higher resolution Cassini views of Calypso (22 kilometers, or 14 miles across) and Tethys (1071 kilometers, or 665 miles across), see
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