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What Causes the Phases of the Moon?
It’s fascinating to watch how the moon changes over a month.For a couple days, it is a full bright circle. Then, it begins to shrink, until only a tiny crescent remains.Then, it disappears all together.Then, it appears again, growing a little bigger each night, until it is full again. What’s going on?
First of all, the changes in the amount of the moon’s surface that is lit up over the course of a month are called phases.The next thing to know is that the light we see coming from the moon isn’t moonlight at all, it is sunlight.The moon does not emit any light itself.The Sun’s light is reflected from the surface of the Moon to us.Because the positions of the Earth, Moon and Sun vary throughout the course of the month,the amount of the moon’s surface that we can see changesa little bit every night.
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