Accretion disk
An accretion disk was a structure that was created when matter falls into a gravitational source, like a black hole or a wormhole.

The black hole at the heart of the Finibus system had a prominent accretion disk, which the  used to help cover its escape from a Gorn destroyer in 2259. ()

Barzan scientists theorized that radiation buildup in the Barzan wormhole's accretion disk was responsible for its brief visible burst every 233 minutes. ()

An accretion disk was present in a subspace compression anomaly studied by the  and the  in 2374. Entering this accretion disk caused the  runabout and her crew to experience miniaturization. ()

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de:Wachstumsscheibe
Celestial objects