Emission and Reflection Nebulae

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A nebula is an interstellar cloud of dust, hydrogen gas, helium gas and plasma. These nebulae may be divided into emission nebulae and reflection nebulae, dependent on how the light we see is created. Emission nebulae contain ionized gas (mostly ionized hydrogen) and shine reddish, while reflection nebulae only reflect light from nearby stars and glow bluish.
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