Which factor is cited as the primary reason Venus is the Solar System's hottest planet, despite not being the closest to the Sun?

Answer

Its extraordinarily thick atmosphere creating a runaway greenhouse effect

Venus holds the title of hottest planet because its thick carbon dioxide atmosphere traps solar energy so efficiently that surface conditions remain relentlessly hot via a runaway greenhouse effect.

Which factor is cited as the primary reason Venus is the Solar System's hottest planet, despite not being the closest to the Sun?
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