twin-stars-castor-and-pollux-the-9-12-geminorum-cluster-and-the-eskimo-nebulahttps://www.astronomy.com/observing/deep-sky-objects/page/45/Deep-Sky Objects | Page 45 of 50 | Astronomy.comDeep-sky objects are celestial objects that exist outside our solar system. Three major types of deep-sky objects are nebulae, star clusters, and galaxies.https://www.astronomy.com/uploads/2021/09/stardome330.gifInStockUSD1.001.00deep-sky-objectsstarsarticleASY2023-05-182013-01-1735846
Deep-sky objects are celestial objects that exist outside our solar system. Three major types of deep-sky objects are nebulae, star clusters, and galaxies.