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Week 7: Exploring moons

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This image shows detail of smooth cryovolcanic lava (labelled as A) on Ariel that has spilled out beyond the end of a trough and covered half of a of 30-km diameter crater (labelled as B). To its lower left, a slightly smaller crater (labelled as C) has been formed by an impact into the lava surface; this crater must therefore be younger.