Billy and Sara are arguing why the moon has a light and dark side.
We only see the lit up part of the moon
No, the moon has a darkside because of the earth's shadow.
Before we begin, note that these models are not to scale.
The Moon has its phases because the Moon moves into the Earth's shadow. When we see a new moon, it is completely out of the shadow.
When the moon orbits the Earth, we see the different phases of the Moon depending on its position. During a full moon, t Earth is behind the Moon and sun, during a new moon, the Moon is between the Sun and Earth.
If the moon was in the Earth's shadow, then that would cause a lunar eclipse. Besides even when the Moon and the Earth are not perfectly in line, we would see a full moon.
Now that I think of it, that makes much more sense than my idea. I should join your side.
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