Photo Agency - Astronomy - Space - Nature

> Open cluster M21 in Sagittarius

Open cluster M21 in Sagittarius

author: V.Toporenko/DSS/Novapix

reference: a-aou65-31002

Image Size 300 DPI: 16 * 20 cm

The open cluster M21, or NGC 6531, in the constellation Sagittarius shows a strong central concentration and a wide range of star brightnesses, despite its limited membership of probably fewer than 60 stars. Most likely quite young (for a star cluster, that means only a few million years), its distance is uncertain. M21 is quite close on the sky to M20, the Trifid Nebula.

Keywords for this photo:

ASTRONOMY - DSS - M21 - MOUNT PALOMAR - NGC 6531 - OPEN CLUSTER - PALOMAR - SAGITTARIUS - STAR - STAR CLUSTER -