A nebula that emits its own light with the characteristic emission line spectrum similar to that of a hot,thin gas is called a reflection nebula.

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A reflection nebula is a type of nebula that reflects the light of nearby stars and does not emit its own light. The emission line spectrum is typical of an emission nebula, which is a type of nebula that emits its own light due to ionized gases.

A Nebula That Emits Its Own Light with the Characteristic