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Emission Nebula
In a Reflection Nebula, the nebulous material is visible because of the reflect light from nearby stars. In an Emission Nebula, the material making up the nebula is also clearly visible, but because of radiation it produces itself. The nebula's energy is ultimately derived from stars often embedded within its own structure, whose radiation causes ionisation within the nebula, leading to a release of energy visible as light.
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  • Eagle Nebula
  • Horsehead Nebula