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Why does the Moon seem to change shape?
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The half of the Moon that points toward the Sun looks bright because it is lit by sunlight. The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. When the Moon is between Earth and the Sun, the lit side is hidden from us. As it moves around Earth, more and more of the lit side comes into view. Then it begins to disappear again. | | It takes 29.5 days for the Moon to orbit Earth. |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
Planets and Moons
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