Titania's surface – a mixture of cratered terrain (including some craters that are partly submerged) and systems of interconnected valleys hundreds of kilometers long but with few impact basins – has clearly been reworked over the past few billion years. According to one theory, Titania was once hot enough to be liquid; the surface cooled and hardened, then the interior froze and expanded, cracking the surface and resulting in the valley systems seen today.
Related entry Uranus, moons
Related category PLANETS AND MOONS
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