What is creating gullies on giant asteroid Vesta?

In a preliminary analysis of images from NASA's Dawn mission, scientists have spotted intriguing gullies that sculpt the walls of geologically young craters on the giant asteroid Vesta. The scientists have found narrow channels of two types in images from Dawn's framing camera -- some that look like straight chutes and others that carve more sinuous trails and end in lobe-shaped deposits. The mystery, however, is what is creating them?

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