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How cold does Mercury get at night?
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Mercury
Mercury as seen by the Messenger probe, January 14, 2008. This image shows half of the hemisphere missed by Mariner 10 in 1974–75 and was snapped by Messenger's Wide Angle Camera when it was about 27,000 km (17,000 miles) from the planet.
During the long nights on Mercury, surface temperatures drop to approximately 90 K (−300 °F, −180 °C) before sunrise.123