Kippax, John Robert, 1849- [from old catalog] · New York and London, G. P. Putnam's sons · leaf 162
Yerkes Observatory Plate X. Star-Cluster in Hercules … Mount Wilson Solar Observatory Plate XL Lace Nebula in Cygnus The Night-Sky of Summer 121 Observatory show, it is said, not six thousand, butsixty thousand stars. Halley, who discovered it in1714, alluded to it as one of the six nebulas known atthat time. Like Omega Centauri, of which it is…
Stars · Constellations · Planets
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