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The  was a web of hyperspace anomalies.

The Galactic Barrier was a web of hyperspace anomalies.

Hyperspace anomalies were phenomena that connected realspace with hyperspace. After the Rebel Alliance destroyed the Second Death Star in 4 ABY, the large number of hyperspace anomalies located in the Moddell sector caused most of the resulting explosion energies to be diverted into hyperspace. This prevented a large-scale devastation of the surrounding moons.[1]

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