why is the sun very hot and moon very cold

Very good answer Aarush. Keep it up !
The sun is a source of heat energy due to the nuclear process inside the star. The production of energy inside the star keeps the temperature very high. But in case of moon, it gets energy from the sunlight most of which is reflected by it so it is cold. Also due to absence of atmosphere, there is no even distribution of heat energy, so there is non-uniform temperature on the moon.

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The sun is very hot because it is just a big plasma ball of hydrogen,held toghether by the mutual gravity of all its mass. The moon is very cold on it's dark side which is downto (-223*c) and in the sunlit side it is very hot upto(123*c).

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