M18 is a sparse open cluster of stars calculated to be 33 million years old. It si in a 27 million year orbit of the milky way, so it has only completed one circuit.
M18 - open cluster in Sagittarius.
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M18 is a sparse open cluster of stars calculated to be 33 million years old. It si in a 27 million year orbit of the milky way, so it has only completed one circuit.
M18 - open cluster in Sagittarius.