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Highly accelerated interstellar gases.

 

One that attracted two-dimensional instinctual beings was 107 km long and one proton wide, with gravitational fields as powerful as a black hole or 100 other stars. It emitted a characteristic set of subspace frequencies as atomic particles decayed along its event horizon, duplicated with the Enterprise-D's parabolic dish to confuse the two-dimensional and halt them long enough to break free of their graviton field wake.