Here are some of the facts:- dosen't have any moon. dosen't have any atmosphere.
3.its temprature is very high in days and very cold at nights.
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Its closer to the big star the sun
its very hottest planet

it is not the hottest planet
mercury is the closest planet to sun . For every two orbits of the Sun, Mercury completes three rotations .the same side of Mercury constantly faced the Sun.
venus is the hottest planet
venus is the second hottest plenet
no venus is the hottest because mercury don't have any atmosphere to trap heat and it loses heat very fast