Alpha Persei Cluster

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What Wikipedia says

The Alpha Persei Cluster, also known as Melotte 20 or Collinder 39, is an open cluster of stars in the northern constellation of Perseus. To the naked eye, the cluster consists of several blue-hued spectral type B stars.

Excerpt from the Wikipedia article “Alpha Persei Cluster”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Martin Gembec (http://astrofotky.cz/~MaG), CC BY-SA 4.0, via Wikimedia Commons.