What looks like a cluster of blue stars in this image (and was called a cluster by Edwin Hubble) is actually a large association of young type-O and -B stars (hot, large, and bright) that shines 2.5 million light years away in the Andromeda Galaxy.
This image is 44x1200" with the Atik 460EXC, 203mm Synta ONTC Newtonian at f/4.95, and an Astronomik CLS filter.
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