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Could you pass Astronomy 101? Take the quiz!

5. What causes the seasons?

Photo Illustration/NASA
A view of the earth, at a distance of about 18,000 miles, as seen by the Apollo 17 crew traveling toward the moon, December 7, 1972.

Earth gets closer to the sun in summer than winter

The sun gets closer to the Earth in the summer

The tilt of Earth's axis

Earth is closer to the hot side of the sun in summer, and the cool side in winter

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