Other
Scientific paper
Jun 1923
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1923natur.111..806j&link_type=abstract
Nature, Volume 111, Issue 2798, pp. 806 (1923).
Other
Scientific paper
DOES not Prof. Lindemann's theory of spiral nebulæ (discussed by Sir Oliver Lodge in NATURE of May 26, p. 702) fail through disregarding the absorption or reflection of radiation which must necessarily accompany any mechanical action of light-pressure? Prof. Lindemann's typical nebula has a mass of about 0.1 gram per sq. cm. of area, which is probably something like the true value; but to get this value, Prof. Lindemann's assumed particles of diameters 10-4 or 10-5 cm. must lie behind one another some thousands deep. The particles in the outermost layer are, no doubt, acted on by light-pressure in the way supposed, but not so those in the inner layers; these are shielded from light-pressure but not from gravitation-and here the whole theory seems to fail. Incidentally, a nebula formed of solid particles lying thousands deep would surely be too opaque for novæ formed in its interior to be seen as novæ.
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