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I expect that it's there to imprison an evil energy being who likes to pretend to be God.

In a few centuries, it will hijack a star ship to escape.

Or maybe a barrier that defend whatever out of the core against the gamma rays?

clearly it's part of how zones of thought are implemented https://en.wikipedia.org/wiki/A_Fire_Upon_the_Deep

Thanks never knew about this one. Gonna make great Christmas read.