CIRCLE WITH A DOT

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M21 is an open cluster located about 3900 ly away in the constellation of Sagittarius.

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evilscientistca@mstdn.ca

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M21 is an open cluster located about 3900 ly away in the constellation of Sagittarius.
At only 6.6 million years old the cluster will still have more massive, hot stars among the longer lived less massive, cooler stars.
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