radio-telescopes-give-clues-to-structure-history-of-the-milky-wayhttps://www.astronomy.com/observing/deep-sky-objects/page/43/Deep-Sky Objects | Page 43 of 47 | 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/wp-content/uploads/sites/2/2021/09/HII-regions-in-Milky-Way-1.jpg?fit=1024%2C574InStockUSD1.001.00deep-sky-objectsstarsarticleASY2023-05-182013-01-1047467
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.