Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 548
s in the heavens are the dense globular starclusters. They cover portions of the sky generally less than30 in diameter, that is, less than the apparent diameter ofthe moon. The brightest of them appear to the unaidedeye as faint fuzzy stars, but a large telescope shows that theyare made up of… … Fia. 171. — The great globular star cluster in Hercules (M. 13). Photo-graphed by Ritchey with the 40-inch telescope of the Yerkes Observatory. Ritcheys photograph, taken with the great 60-inch reflectorof the Mt. Wilson Solar Observatory, shows more than 50,000stars. The great cluster Omega…
Astronomy
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