Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  HD171445  ·  HD171495  ·  HD171524  ·  HD171572  ·  HD171612  ·  HD171737  ·  M 22  ·  NGC 6656  ·  PK009-07.1
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M22 Cluster in Sagittarius near Milky Way bulge, Charles Pevsner
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M22 Cluster in Sagittarius near Milky Way bulge

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M22 Cluster in Sagittarius near Milky Way bulge, Charles Pevsner
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M22 Cluster in Sagittarius near Milky Way bulge

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Description

M22 is thought to contain about 80,000 stars, all crammed together in a diameter just 86 light years across.  At just 10,000 light years away, it is one of the closest and brightest of the 150 known clusters in the Milky Way.

It is not well understood where globular clusters come from or how they formed; especially puzzling because they (usually) lack a central black hole, and appear to lack significant dark matter.

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    M22 Cluster in Sagittarius near Milky Way bulge, Charles Pevsner
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    M22 Cluster in Sagittarius near Milky Way bulge, Charles Pevsner
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M22 Cluster in Sagittarius near Milky Way bulge, Charles Pevsner