February - halos You are here: Home Photo gallery Astronomy Deep-sky Open clusters

Open clusters are groups of stars, usually hundreds or thousands of them, or even more. In open clusters the stars appear loosely grouped (such as the Pleiades). All stars in an open cluster formed at some point from interstellar gas and therefore all have approximately the same age. One of the most well-known open clusters is M45, the Pleiades or Seven Sisters.

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