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Short Nonfiction Collections - Book 1

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The Use of the Spectroscope to Determine Motions in Space

There are certain indications of the presence of a selective absorbing medium in space. Such a medium would render the blue end of the spectrum of a distant star much fainter as compared with the red end than in the case of a near star. It could be tested by the stars forming a cluster like the Pleiades which are doubtless all at nearly the same distance from us. A more delicate test would be to measure the intensity of different portions of the spectrum at a time when the light is changing most rapidly. If we could determine our motion with reference to the ether we should have a fixed line of reference to which all other motions could be referred.

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