Quote:
Originally Posted by Placidus
Four billion years seems utterly antique for an open cluster. Getting up towards globular cluster territory. Open clusters normally fall apart after just a few million years.
Best,
MnT
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Yes, it's a weird cluster. At one time there was speculation that it could be an evaporated globular cluster, but that seems not to be the case.
Some info here
https://en.wikipedia.org/wiki/Messier_67
and a nice wide field shot here, which looks very globular clusterish
https://apod.nasa.gov/apod/ap070809.html