A deep-sky object refers to astronomical objects that are located outside of our Solar System and are typically observed in the night sky rather than viewed as part of celestial bodies like planets or stars. These objects can include a variety of categories, such as: 1. **Galaxies**: Massive systems composed of stars, gas, dust, and dark matter. The Milky Way is an example of a galaxy. 2. **Nebulae**: Clouds of gas and dust in space.
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