Transcript: Uranus has several moderate sized moons. Of these, the innermost, Miranda, is the most interesting. Its size is about 470 kilometers. It has an icy, heavily cratered surface. Thus, there is significant indications of young features, the icy regions and also ridges and fractures reminiscent of Ganymede. One cliff rises at a forty five degree slope, 16,000 feet above the surface of this small moon, a unique feature in the solar system. Scientists speculate that tidal heating in the past has caused tectonic activity which has led to the fractured young surface features.