Bodies
5 bodies
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Mercury
The smallest planet: airless, cratered, and swinging 600 degrees between noon and midnight.
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Venus
Earth's twin in size only — a runaway greenhouse under acid clouds.
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Europa
An ice shell over a global ocean holding more water than all of Earth's seas.
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Titan
Saturn's largest moon: a thick atmosphere and rivers of liquid methane.
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The Moon
The only other world humans have walked on.