From Mercury, the Sun would appear much larger and brighter than it does from Earth. This is because Mercury is closer to the Sun than Earth is. The Sun would take up a much larger portion of the sky as seen from Mercury, and it would be so bright that it would be difficult to look at directly. The surface of Mercury would be extremely hot during the day, but very cold at night. This is because there is no atmosphere on Mercury to insulate the planet. The daytime temperature on Mercury can reach up to 450 degrees Celsius (840 degrees Fahrenheit), while the nighttime temperature can drop to -180 degrees Celsius (-290 degrees Fahrenheit).