Abstract
PROF. LINDEMANN'S idea that the spiral nebulæ may be clouds of particles small enough to be repelled by light is of considerable interest. But we must remember that light carries with it another potential influence which it exerts when it encounters matter, namely, the power of ejecting an electron with an energy of the same order as that of the electron responsible for the light. Star-light, therefore, should be able to eject electrons with enormous energy; and this kind of induced radio-activity may have several partly unforeseen results. A stellar variety of spectrum is one of them, if a continuous spectrum can be composed of a multitude of fine lines, with gaps only where the specific exciting radiation was absent.
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LODGE, O. Gravitation and Light-Pressure in Spiral Nebulæ. Nature 111, 702 (1923). https://doi.org/10.1038/111702a0
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DOI: https://doi.org/10.1038/111702a0
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