The book Elements of Astronomy was written by author Rolfe, W. J. (William James), 1827-1910 Here you can read free online of Elements of Astronomy book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of Astronomy a good or bad book?
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When, therefore, we know the weight of a body and the speed with which it 292 CONSERVATION OF ENERGY. is moving, we can easily calculate how much heat will be generated on stopping it. Were the earth's motion arrested, its elements would melt with fervent heat, and most of them would be con- verted into vapor. Were the earth to fall into the sun, the heat generated by the shock would be sufficient to keep up the solar light and heat for 95 years. We know that countless swarms of meteoric bodies... are revolving in rings about the sun, and the well-known retardation of Encke's comet shows that these bodies must be moving in a resist- ing medium. If so, they must eventually be drawn into the sun, and, from the velocity with which they must strike, it has been shown that they could fall in sufficient numbers to generate all the light and heat of the sun, without in- creasing his magnitude enough to be detected, since ac- curate measures of his diameter were first made. This theory of the sun's heat was first published by Mayer in 1848, and was further developed by Thomson in 1854.
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