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Memory Alpha

An accretion disk is a structure that is created when matter falls into a gravitational source, like a wormhole.

The Barzans theorized that radiation buildup in the Barzan wormhole's accretion disk was responsible for its brief visible burst every 233 minutes. (TNG: "The Price")

An accretion disk was present in a subspace compression anomaly studied by the USS Defiant and the USS Rubicon in 2374. Entering this accretion disk caused the Danube-class runabout to shrink. (DS9: "One Little Ship")

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