Sentences with phrase «conspicuous open cluster»
Immediately south of the star cloud, separated by a dark band, is the emission nebula IC 1283 - 1284, with two adjacent reflection nebulae, NGC 6589 and NGC 6590, all these nebulae associated with the little conspicuous open cluster NGC 6595.
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The density waves first concern interstellar matter, which is compressed, forms diffuse nebulae which become starforming regions, and later form (open) clusters and associations of young stars, the most lumionous and conspicuous of which are massive, hot, blue and short - lived.