In the open clusters x and h of Perseus, red giants and supergiants are found, in contrast to the Pleiades, where there are only

In the open clusters x and h of Perseus, red giants and supergiants are found, in contrast to the Pleiades, where there are only blue giants. Which clusters are older?

Clusters x and h of Perseus. Their age is about 1 billion years. Most of the stars from these clusters have already become red giants and supergiants in the process of evolution.

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