Despite being closest to the sun, Mercury is not the hottest planet. The hottest planet is Venus (at 462 Celsius).
But Why ???
posted by Di-G on Space Science Qs.
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The magnitude of Venus changes on a cyclical basis. Its brightness is determined by its proximity to Earth and the amount of light it receives. It doesn't shine brightest when it's closest to the earth since it's between the earth and the sun, therefore the side farthest away gets lit - like a new moon. It's also not at its brightest when it's full, because that's when it's facing us in relation to the sun.
In contrast, Venus is visible for much of the night, and is often one of the first objects to appear in the evening sky and one of the last to disappear in the morning. Its brightness and visibility have made it a popular object of study for astronomers, who have used it to learn more about the nature of planets and their atmospheres.