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Updated: July 1, 2025
It was only necessary to calculate the total amount of heat which could be generated by the total mass of our solar system in falling together to the sun's centre from "infinity" to find the total heat-supply to be drawn upon.
This heat-supply is so uniform and so cheap that it has quite driven out all the old forms of fuel wood, coal, natural gas, etc. And then he told me something which shocked me greatly. You know that according to our old-fashioned ideas it is unjustifiable for any person to take his own life, and thus rush into the presence of his Maker before he is called.
The demonstrated wide distribution of radio-active matter making it at least an open question whether all matter does not possess this property in some degree has led to the suggestion that the total heat of the sun may be due to radio-active matter in its substance. Obviously, then, all estimates of the sun's age based on the heat-supply must for the present be held quite in abeyance.
It was found forthwith by that other great German, Helmholtz, who pointed out that the falling matter through which heat may be generated might just as well be within the substance of the sun as without in other words, that contraction of the sun's heated body is quite sufficient to account for a long-sustained heat-supply which the mere burning of any known substance could not approach.
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