NGC 2237 Rosette Nebula A giant emission nebula located near one of the large molecular clouds in the constellation Monoceros. It is a region of ionized hydrogen where star formation is taking place. At the center of the nebula lie the bright blue stars of the open cluster NGC 2244. Discovery date: 1871 Distance: 5,200 light-years Diameter: 130 light-years Apparent dimensions: 80′ × 50′
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