I Star Trek finns ett fält av negativ energi, känd som Galactic Barrier . Senare när Enterprise-D kastades in i en annan galax, upplevde de emellertid inte barriären. En sådan barriär, till ett samhälle som kan varva resor, verkar vara en form av inneslutning. Är det någonsin förklarat vem (eller vad) gjorde denna barriär, och varför?
I sträng kanon vet ingen.
Greg Cox's Star Trek: The Next Generation - Q Continuum novels state that the galactic barrier was in fact created by the Q Continuum as a method of preventing the powerful being known only as "0" from returning to the Milky Way Galaxy, from which he was banished for his destruction of the Tkon Empire. These novels also explain that the telepathic powers that occur as a side effect of exposure to the barrier in telepaths are caused by the power of the Q that exist in the barrier, while those who develop a god complex are 'infected' by the presence of 0, who constantly attempts to affect beings on the other side to give himself access to the galaxy once again.
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