Everyone takes it for granted that the sun will go on shining until he diesand, as a matter of lesser interest, for a long time after he dies. Astrophysicists, who believe the solar star-stuff has been hot for billions of years and will be so for billions of years more, have long cudgeled their brains for a reason why. Most favored of recent theories is that hydrogen is the fuel. It is known that the sun does not "burn" hydrogen, in the sense of releasing stored chemical energy as from coal; it physically changes...
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