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

reflection nebula
subject			fact

reflection nebula	has definition 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).
	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 reflection nebula :

• cometary nebula (1 kind, 6 facts) - A reflection nebula with a fan shape that bears a superficial resemblance to a comet. Classical examples of the heads of cometary nebulae are R Mon, R CrA, and RY Tau. All have A0-G0 type spectra that resemble the spectrum of a T Tauri star, and their brightness varies from year to year.
• Hind's nebula (7 facts) (NGC 1554, NGC 1555) - A reflection nebula illuminated by the star T Tauri. It is remarkable for its changes in brightness.
• NGC 1999 (3 facts)