We all know why mercury is extremely hot and have a valid reason. But It is also proved that its surface is extremely cold also like temperature fell up to -170degrees.On the day its temperature is around 840-degree Fahrenheit (451-degree Celsius) but at night it goes minus 275 Fahrenheit (-170 degrees Celsius.) You can see a change of temperature of nearly 1100 degrees Fahrenheit (600-degree Celcius). It’s all because of Mercury’s thin atmosphere that can not maintain the heat that it gets in the day and because of its huge day and night.