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(Continued from Page 1) These photographs have shown that some of the very remote ne bulae, at distances greater than 100 million light years (a light year is six million of million miles) apparently have velocities in the line of sight as large as 12,000 miles a second! The direction of the motion is always away from the earth, that is they appear to be reced ing, and Dr. Edwin P. Hubble has shown that the velocities be come larger as the distance in creases. How are these spectrum photo graphs obtained and measured? In order to produce a spectrum an instrument called a spectro graph must be attached to the telescope. In the spectrograph is a prism through which the light of the nebula must pass. On emerging from the prism the light is broken up into colors, each color emerging at a slightly different angle, thereby forming a spectrum. This spectrum is then photo graphed with a camera lens, also mounted in the spectrograph. If the spectrum of a faint nebula is to be photographed the scale must be kept as small as pos sible. This is accomplished in the Mt. Wilson spectrograph by
Newspaper Details
Beatrice Daily Sun
Beatrice, Nebraska, US
Thu, Jun 11, 1931
Page 11
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USA 18 May 2026
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