Why is it hotter inside an isolated car (air conditioning is off) than outside during a sunny day in summer?
Answer
The heating of the car is the same as the heating of the Earth due to the greenhouse effect--- the sun shines through the glass depositing very energetic photons whose equilibrium temperature is 5000 degrees, but the interior surfaces reradiate that light as photons whose temperature is at the interior temperature. The interior end up at a higher temperature, where the outgoing thermal power is equal to the incoming non-thermal solar power.
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