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globular cluster▼(large spherical star cluster)noun[UK: ˈɡlɒ.bjʊ.lə(r) ˈklʌ.stə(r)] [US: ˈɡlɑː.bjə.lər ˈklʌ.stər]
star cluster▼(group of stars)noun[UK: stɑː(r) ˈklʌ.stə(r)] [US: ˈstɑːr ˈklʌ.stər]
open cluster▼(large spherical star cluster)noun[UK: ˈəʊ.pən ˈklʌ.stə(r)] [US: ˈoʊ.pən ˈklʌ.stər]
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