Enceladus
  • satellite of Saturn discovered by William Herschel in 1789. 600km across, it has a 1.37 day, 238 000km orbit precisely in the plane of Saturn’s orbit. Enceladus has a surface which is apparently almost free of craters, implying that some process is sweeping it clean of them. It is also very white, with the highest albedo of any object in the solar system.

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