mercury is the hottest planet becaue it near to the sun.
neptune is the coldest planet because it was very far from the sun
dest
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Actually, VENUS is the hottest planet, because of its dense atmosphere and runaway greenhouse effect. It is +460C everywhere on Venus, even at the poles, day and night. Mercury only gets up to +427C at high noon on the equator, and drops to 193C in the middle of the night, so its average temperature is quite a bit lower than that of Venus.
neptune is coldest because-Because it is the farthest from the Sun.the heat of sun cannot reach it properly making it coldest planet.
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