Welcome to You Ask Andy

Keith Whitman, Age 12, Of Columbia, B.C.,, for his question:

Why don't we see the dark side of the moon during an eclipse?

In a solar eclipse, the round moon is exactly between us and the sun. The sun is about 400 times larger than the moon, and it is 400 times farther away from us. This makes the moon seem 400 times larger than it actually is  large enough to blot out the face of the sun completely.

When this happens, the sun is shining on the other side of the moon and all we see is a black disc. We see only that part of the moon which is covered with sunshine. During an eclipse, the sunlit side of the moan is turned away from us.

 

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