Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 408
(a) Thk Pleiades. … THE STELLAR UNIVERSE 357 the Hercules cluster (Plate XXI, b) is the typical example, forma limited class of objects, the number known being about ninety.Their distribution shows some features of importance ; ingalactic longitude, they mostly occur between longitudes 235°and 5°, in the…
Astronomy
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