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The only difference between a full moon and a crescent moon is simple: the amount of light reflected off the moon, from the sun, towards the earth, where we can observe it.

As the moon orbits the earth, at times, part of the moon will be obscured by the earth, allowing a shadow to be casted onto the moon by the earth. When the relative positions of the sun, earth and moon are not in line with each other, there will be no shadow cast on the moon, thus a full moon is seen. When they are slightly in line, with the earth in the middle, then part of the moon will be in the earth's shadow. Whether or not this part-moon is a crescent depends on the amount of reflected light we are able to see.

You might want to take a look at the phases of the moon, the orbit of the earth around the sun and the orbit of the moon around the earth to have a better understanding of how moon phases are formed. Other moon phases include the new moon (nothing can be seen) and the gibbous moon (opposite of the crescent, where most of the moon can be seen, instead of only a bit.

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14y ago

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What is the different shapes of the lit part of the moon called?

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