![USS Enterprise-C approaches temporal rift](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/7/7d/USS_Enterprise-C_approaches_temporal_rift.jpg/revision/latest/scale-to-width-down/180?cb=20161206190950&path-prefix=en)
A Kerr loop created from superstring material
A superstring was an astronomical phenomenon that could result in the formation of a Kerr loop.
In 2344, a temporal rift which was the formation of a Kerr loop from superstring material, was created through the intense weapons fire in a battle between the USS Enterprise-C and four Romulan Warbirds at the Klingon outpost at Narendra III. The Enterprise-C was inadvertantly responsible for the creation of an alternate timeline when it drifted into the rift and traveled through time. (TNG: "Yesterday's Enterprise")