And global warming is expected to slow this down: the hotter the surface layer becomes, the longer the replenishment takes.
The hotter the surface, the great the emitted infrared radiation's intensity.
"How hot is the surface of the sun?
At 4000°C, it is almost as hot as the surface of the sun, but enormous pressure keeps it solid.
The outer core is a swirling mass of molten – or liquid – metal and it's as hot as the surface of the Sun! Wow!
The ensuing collision creates enough heat to produce a plasma 300 million times hotter than the surface of the sun.
Temperatures in the arc column can reach more than 14,000 °C (25,000 °F), which is hotter than the surface of the Sun.
The temperature in the vicinity of the lightning can reach between 20,000 and 30,000 degrees, far hotter than the surface of the sun.
High up the temperature is close to -145C (-229F), but near the centre this rises to 24,000C (43,232F), hotter than the surface of the sun.
The machine, which usually analyzes rocks, vaporized the syrup, then pushed it through a 15,000-degree plasma flame — hotter than the surface of the sun.
