THE INSIDE OF A STAR
•PROBLEMS LIKE A CROSS-WORD PUZZLE. Professor A. S. Eddington, Plumian Professor of Astronomy in the University of Cambridge, lectured in the University of Manchester on ‘ The Interior of a Star.’ He discussed certain recent thoilretical formula) for calculating the internal heat and pressure of a star. It was calculated, ho said, that the heat of a typical star at the centre was from 5,000,000 to 20,000,000 degrees. The validity of the formula? adopted depended upon the assumption that the given star was a perfect gas. Stars varied iu density. The sun, for instance, had a density rather higher than that of water. Some had a density like that of air; others a density ranch higher than that of the sun, 'approaching even the density of platinum. Was it not possible that (stellar material might have a high density—a.s high as 50,000 times that of water—and yet remain perfectly gaseous? There was reason to think it was. At all events the problems involved were like a cross-word puzzle, in the eonse that they were only at the fascinating stage of filling' in certain words which appeared to fit. Presently they might reach a stage at which they would be compelled to use the india-rubber. freely.
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Evening Star, Issue 18998, 21 July 1925, Page 3
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209THE INSIDE OF A STAR Evening Star, Issue 18998, 21 July 1925, Page 3
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