Mercury is the hottest planet while Neptune is the coldest.
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Solution
Mercury is the hottest planet because it is nearest to the Sun and stands at a distance of 58 million kilometres from the Sun. Hence, Mercury receives the maximum amount of sunlight.
On the other hand, Neptune is the coldest planet because it is farthest from the Sun and stands at a distance of 4,497 million kilometres from the Sun. Hence, Neptune receives the least amount of sunlight among all planets in our solar system.