A long time ago, people looked into the dark night sky and wondered about the stars, meteors, comets and planets that they saw. The only tools that they had to study space were their eyes and their imagination. They had no other tools to help them learn what these lights in the sky really were. As people studied the night sky, they noticed patterns in the stars, which we call constellations. They also noticed that different stars could be seen during different times of the year.

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