Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 52
ith the naked eye. The term nebula has been used to designate any of thosecloud-like patches of faintly luminous matter, of which thou-sands are seen by the telescope to be scattered over the darkbackground of the heavens. It has been shown by the spectroscope that some of these OF THE STAKS. 47… … Fig. 18. Star map of a small area in the constellation Gemini. nebulae when seen with small telescopes are found to beclusters of stars when viewed with instruments of higherpower. For this reason it has been found convenient to callall of these objects nebulae, and then to designate the twoclasses…
Astronomy
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