Emission and reflection nebulae primarily differ in their interactions with light.
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Emission Nebulae: These nebulae emit their own light, often due to the ionization of gas and dust by nearby hot young stars. They typically appear in colors such as red due to the emission of hydrogen.
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Reflection Nebulae: These do not emit their own light but rather reflect light from nearby stars. They usually appear blue because blue light is scattered more than red light.
So, the most appropriate response to highlight their difference is interactions with light.
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