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Detailed explanation-1: -(But Mercury is not the hottest planet in the solar system. The hottest planet is Venus .) On its dark side, Mercury gets very cold because it has almost no atmosphere to hold in heat and keep the surface warm.

Detailed explanation-2: -Mercury is very close to the Sun, and hence, is the hottest planet in the solar system. Its temperature goes above 400∘C.

Detailed explanation-3: -Venus’ thick atmosphere traps heat creating a runaway greenhouse effect – making it the hottest planet in our solar system with surface temperatures hot enough to melt lead. The greenhouse effect makes Venus roughly 700°F (390°C) hotter than it would be without a greenhouse effect.

Detailed explanation-4: -Venus is the exception, as its proximity to the Sun, and its dense atmosphere make it our solar system’s hottest planet. The mean temperatures of planets in our solar system are: Mercury-333°F (167°C) Venus-867°F (464°C)

Detailed explanation-5: -Its thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system with surface temperatures hot enough to melt lead. It is blanketed with a thick atmosphere of carbon dioxide – the gas that we breathe out.