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"These photographs give us new insight into how comets work," says Brownlee. "It seems that they're not just balls of rubble, but they're not solid like asteroids or the moon, either. The surface of Wild 2 is made out of something that's less dense than rock or solid ice, but that holds together enough to support topography. We can see 300-foot-tall cliffs and spires — it's like Monument Valley in Arizona."
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