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The temperature swings on Mercury are the most extreme in the solar system.

Although Mercury is the closest planet in our solar system to the sun, its surface temperature can still reach astonishingly frigid lows. In areas illuminated by sunlight—that is, daytime on Mercury— temperatures can reach about 427 °C. While interestingly, this is not quite as hot as Venus' 471 ° C, here's the kicker: because Mercury has no true atmosphere of gases, the temperature in areas not receiving sunlight can plummet to -173 °C. That's a temperature difference of 600 °C!

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