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What are some common features of the Moon and Earth?

Compare the surfaces of Callisto, Io, and the Earth's Moon. Explain what this comparison tells us about the ages of features on there surfaces.

  • Answer:

    Cratering is random in time — the epoch of impact cannot be predicted. It is also random in space — the pattern of craters on a planetary surface has no pattern. In a counting experiment, the error depends on the square root of the number of events.

Brian Perez-Lemus at ChaCha Visit the source

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Callisto is made of approximately equal amounts of rock and ices (water ice, methane ice, and ammonia ice), and investigation by the Galileo spacecraft revealed that Callisto may have a small silicate core and possibly a subsurface ocean of liquid water. This makes is completely different in composition from the moon.

Jennifer Lancaster

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