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physical object > natural object > celestial body > ring

ring
subject			fact

ring	is a part of Saturn ring system
	has width
	has definition A system of four concentric rings, only about 2-4 km thick. The outermost ring is ring A, then comes Cassini's division, then ring B (also called the bright ring), then Lyot's division, then ring C (the crepe ring), then ring D (discovered in 1969). The rings are a swarm of solid particles, probably jagged rocks about 1 meter to 1 km across (1973), not ice as previously had been assumed, inside the Roche limit. Bobrov (1969) estimates the total mass of the rings to be about 0.01 the lunar mass.
	is a kind of celestial body
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 ring :

• A ring (2 facts)
• B ring (2 facts)
• bright ring (2 facts)
• Crepe Ring (9 facts) (C ring) - Rather transparent inner ring of the saturn ring system., The second innermost ring of Saturn, it has fewer particles and is less dense than the outer rings; therefore, it is harder to observe.
• D ring (4 facts) - The innermost ring of Saturn.
• E ring (2 facts)