Why Mercury is very hot during the day and very cold at night?

Mercury has nearly no atmosphere. Without an atmosphere, Mercury cannot reflect sunlight or trap heat. This is the reason why days on Mercury are very hot and nights are very cold.

In the daytime, the solar energy directly strikes the planet's surface because there is no atmosphere to reflect heat, making a sizzling temperature of 427 Celsius (800 Fahrenheit).

At night, without an atmosphere to trap heat, the solar energy escapes quickly into space, resulting in a freezing temperature of -173 Celsius (-290 Fahrenheit).
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Its gravitational force is not strong enough to hold an atmosphere. Due to the absence of atmosphere, the heat is quickly lost at night and becomes freezing cold (about -200 degree Celsius) That's what I know..... Plzz do like....
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Mercury is very hot during the day (about 400 °C). Its gravitational force is not strong enough to hold an atmosphere. Due to the absence of an atmosphere, the heat is quickly lost at night, and it becomes freezing cold (about - 200 °C).
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During the day , sunlight strikes the surface of Mercury. But due to its very thin atmosphere no heat (excess sunlight) can be reflected. So during daytime, the surface of the planet Mercury becomes too hot. The temperature rises more than 400°C

Our Earth has a thick atmosphere that traps enough sunlight during the day to keep the surface warm during night.

But Mercury has thin atmosphere.So it doesn't trap any sunlight during the day at all. During night all the sunlight gets reflected and so the surface becomes too cold. The temperature deeps as low as below - 170°C.
 
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