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Updated: July 7, 2025
Deslandres' five additional prominence-rays, for instance, were at once seen to make part of the series, because conforming to its law; while a group of six dusky bands, photographed by Sir William and Lady Huggins, April 4, 1890, near the extreme upper end of the spectrum of Sirius, were pronounced without hesitation, for the opposite reason, to have nothing to do with hydrogen.
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