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How hot does Mercury get during the day?
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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 day, surface temperatures on Mercury can be extremely high. At specific locations on the planet's equator known as "hot poles," where the Sun lingers at noon, surface temperatures can exceed 700 kelvins (K; 800 °F, 430 °C).123
It is important to note that temperatures vary significantly across the planet. While these equatorial regions experience intense heat, other areas, such as the "warm poles" located 90° away, do not reach such high temperatures. Additionally, surface temperatures drop drastically to about 90 K (−300 °F, −180 °C) during the planet's long nights.213