If coal could burn in the sky

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"Can you imagine a block of coal one mile high, one mile high and one mile broad? Going further, will you try to conceive 700,000 millions of such monstrous blocks, all alight and burning fiercely in the skies, as is here, but very partially depicted? If you grasp this mighty "game of pretend" and can assume that the millions of blocks flare away in one hour, you have an actual idea of the heat pouring from the sun during that short period of time."

Source: "The Children's Encyclopaedia" (1910)

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