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Why doesn't the full moon look like a globe?

Asked by ETpro (34605points) July 9th, 2010

When you look at a full moon, it appears to be a grayish-white disk hanging in the nighttime sky. It doesn’t look spherical, with gradually shaded sides. Why?

Look at a ping pong ball, even in full sun, and it is clearly a sphere. Same goes for a basketball or for even big spherical objects like those bulbous water towers. What makes the moon such a unique sphere?

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