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

dark nebula
subject			fact

dark nebula	has density up to 104 particles per cm3
	is a part of dust
	has definition 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.
	is a kind of nebula
nebula	is a part of gas
	has catalog nebula catalog
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of dark nebula :

• Bok globule (4 facts) - A compact, spherical dark nebula that absorbs radiation. Estimates of their mass suggest that their density is too low for gravitational collapse. They tend to lie in regions of much dust but less gas than would be expected for star-forming regions.
• Coalsack (5 facts) - A prominent dark nebula readily visible to the naked eye, located on the galactic plane.
• Horsehead Nebula (4 facts) (NGC 2024) - An absorption nebula in the middle of Orion.

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