open-cluster-m21-globular-cluster-ngc-6553-and-the-lost-in-space-galaxy-ngc-6503https://www.astronomy.com/observing/deep-sky-objects/page/27/Deep-Sky Objects | Page 27 of 49 | 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-objectsgalaxiesarticleASY2023-05-182015-07-0944194
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.