Open clusters Messier 46 and Messier 47 in the constellation Puppis.
Messier 47 (right), a bright loose cluster, and Messier 46 (left), a fainter but very rich open cluster. Loose cluster at top right is NGC 2423. Planetary nebula NGC 2438 is at north edge of Messier 46.
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Photo credit: © Alan Dyer/Stocktrek Images / Alamy / Afripics
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