A list of nebulae typically refers to a compilation of nebulae, which are vast clouds of gas and dust in space, often serving as regions of star formation or remnants of dead stars. Nebulae can be categorized into several types, including: 1. **Emission Nebulae**: These nebulae emit their own light due to ionization of the gas by nearby hot stars. An example is the Orion Nebula (M42).
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