I've chosen this topic because I believe the night and day cycles are quite interesting.
Night and day are both caused by the rotation of the Earth. Each rotation lasts about 24 hours, which is a day. Since the Sun stays in its place, Earth just rotates and one side of the earth will be shown to the Sun and the other side will be receiving no light until it rotates back around to face the Sun again, which is night time. Though it doesn't feel like we're moving, it appears that the Sun, Moon and the other stars are moving even though we're the ones rotating.
The diagram shows the Earth and what it looks like for both day and night. The light rays hit the Earth from the front, and on the other side is darkness, which signifies night time.
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