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physical object > natural object > celestial body > nebula > dark nebula > Horsehead Nebula

Horsehead Nebula comparison table

Subject	has definition	has synonym	is a kind of	is an instance of
dark nebula	A relatively dense cloud of interstellar matter whose dust particles obscure the light from stars beyond it and give the cloud the appearance of a region devoid of stars.		nebula
Horsehead Nebula	An absorption nebula in the middle of Orion.	NGC 2024		dark nebula

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