Exploring the Night Sky with Hubble’s Caldwell Catalog by Staff December 30, 2019 December 30, 2019 30 views 30This loose collections of stars, known as an open star cluster, is image 100 of the Caldwell catalog. 0 FacebookTwitterPinterestEmail previous post Make a Personal Budget With Microsoft Excel in 4 Easy Steps next post 10 Simple Design Rules for Professional Microsoft Word Documents