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physical object > natural object > celestial body > nebula > reflection nebula > NGC 1999

NGC 1999 comparison table

Subject	has image	has definition	is a kind of	is an instance of
reflection nebula		A cloud of interstellar gas and dust whose spectrum contains absorption lines characteristic of the spectrum of nearby illuminating stars. The emission component of its spectrum is due to gas; the reflection component, to dust (see also diffuse nebula).	nebula
NGC 1999				reflection nebula

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