Nebuleuse Barnard 86 & open cluster NGC 6520 - Dark nebula Barnard 86 and open...

Nebuleuse Barnard 86 & open cluster NGC 6520 - Dark nebula Barnard 86 and open cluster NGC 6520 - NGC 6520, is a cluster of young stars, aged a few million years. To its right is the dark nebula, Barnard 86, a cloud of molecular gas and dust, very cold, in which these stars have become formed. In the background, the billions of years old stars of Sagittarius. NGC 6520 is a small cluster of young blue stars. In the same region is a dark cloud, Barnard 86. The cluster and cloud are probably associated and the dust is visible only because it blocks out light from the myriads of stars beyond. On the distant background, old yellowish stars in Sagittarius are visible in vast numbers