| 21. | Scutum also boasts a couple of fine star clusters.
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| 22. | Serpens South is a star cluster embedded in a dense molecular filament containing numerous protostars.
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| 23. | Delta Cephei, the prototypical classical Cepheid variables, is also a member of a star cluster.
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| 24. | In 2005, astronomers discovered a completely new type of star cluster in the Andromeda Galaxy.
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| 25. | He discovered or rediscovered three open star clusters, Westerlund 1, Westerlund 2 and Westerlund 3.
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| 26. | This star cluster is estimated to be around two and a half million years old.
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| 27. | He also led an expedition to Chile in 1882 to observe the Hyades star cluster.
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| 28. | There is no systematic bias in the Hipparcos data when it comes to star clusters.
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| 29. | The objects are in a star cluster field called Sigma Orionis within the constellation Orion.
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| 30. | Located 7200 light years away, the Wizard nebula, surrounds developing open star cluster NGC 7380.
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