Our World, Other Worlds Game Show

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Our World, Other Worlds

Test your knowledge of how Earth is different from other planets.

Earth is the only body in the solar system thought to have oceans of liquid water.
Earth is smack in the middle of the "habitable zone" around the sun, where temperatures are right for liquid water to exist.
Mars once had running water that carved canyons and other features into its surface. What happened to the water?

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NASA

Science

Climate

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