Mercury has the widest variation in surface temperatures between night and day of any planetin the solar system.

Question

Quizplus · Accepted Answer

Mercury's lack of atmosphere means that there is no insulation against the extreme heat of the Sun during the day or the extreme cold in the night. This leads to a temperature variation of up to 600 degrees Celsius (1,100 degrees Fahrenheit) between the hottest and coldest parts of the planet. Due to its lack of atmosphere and slow rotation, Mercury experiences extreme temperature differences between its scorching hot daytime side (over 800 degrees Fahrenheit) and its freezing cold nighttime side (below -290 degrees Fahrenheit).

Mercury Has the Widest Variation in Surface Temperatures Between Night