While Charles Messier found M37 (along with M36) on Sept. 2, 1764, he wasn’t the first to discover this cluster. Giovanni Battista Hodierna (sometimes spelled Odierna) had noted it — along with M36 and M38 — 110 years earlier in a book on cometary and non-cometary celestial objects.

The premier open cluster in Auriga, M37 is the richest of the Charioteer’s three Messier clusters, with about 150 stars brighter than magnitude 12.5 packed in a region 24′ across. Its integr

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