What is the difference between an umbra and a penumbra

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What is the difference between a gibbous moon and a crescent moon? The Moon changes phase every how many days? What is the difference between an umbra and a penumbra?

Reference no: EM131237910

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What is the difference between an umbra and a penumbra : What is the difference between a gibbous moon and a crescent moon? The Moon changes phase every how many days? What is the difference between an umbra and a penumbra?

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