Planet Mercury is closest to Sun than planet Venus.
But, Venus is hotter than Mercury !!!
This is because of 3 reasons ----
1. Venus has a super thick atmosphere
Venus is wrapped in a very thick atmosphere. Its 96% CO2 !!!
CO2 traps heat. Sunlight gets in but can't escape back out.
Mercury barely has an atmosphere. Heat just radiates back into space.
2. Mercury swimgs widely, Venus doesn't
Mercury has no air to spread the heat around.
Venus thick CO2 spreads heat everywhere. No cold nights. Day and night both are hot.
3. Venus has bright clouds that bounce 70% of sunlight away. So Venus gets less direct sunlight than Mercury !!!
But the heat which gets in, get trapped by CO2 and never leaves making Venus hottest planet in solar system.
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