Dust clouds of Sagittarius

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Milky Way Galaxy, Nebulae, Star Clusters, Astronomical Photography, Galactic Nuclei, H Ii Regions, Sagittarius Constellation, Stellar Temperature

Scientific paper

The development of knowledge of the exact nature of the dust clouds in the southern Milky Way galaxy is traced. First observation of the clouds were made by Herschel in 1784, and identification came with Barnard in 1916. The region around Barnard 86 is reviewed, noting the presence of the cluster NGC 6520 and NGC 6523, which is an area of a wide and dark dust lane backed by a blue nebulosity. Further attention is given to the blue objects NGC 6589, and NGC 6590, the Trifid nebula M20, the H II region NGC 6559 and IC 1274-5, and the six hot stars in the Sagittarius constellation.

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