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The Eta Carina Nebula contains 4 open clusters within its boundaries. The most obvious are Trumpler 14, 16 and Cr228. Tr 14 and 16 are fairly tight and rich while Cr 228 loose and large, but still contains dozens of bright stars which together create a rich starfield within the boundaries of the nebula. A 4th cluster, Trumpler 15, lies in the northern reaches of the nebula and is similar to Tr 14 and 16 in compactness, but is somewhat poorer in its star count.
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