Saturn’s moons photographed by the Cassini spacecraft’s narrow-angle camera

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Three of Saturn’s moons have been photographed by the Cassini spacecraft’s narrow-angle camera. As the largest of the three, Tethys (C) is round and has a variety of terrains across its surface. Hyperion (L, top) is the ‘wild one’ with a chaotic spin, and Prometheus (L, bottom) is a tiny moon that busies itself sculpting the F ring. The surface of Tethys is 1,062 km across, Hyperion 270 km across, and Prometheus 86 km across. In this picture the view looks toward the sunlit side of the rings from about one degree above the ring-plane. The view was acquired at a distance of approximately 1.9 million kilometers from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 22 degrees. The Cassini-Huygens mission is a cooperative project of Nasa, the European Space Agency (ESA) and the Italian Space Agency (ASI).

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