In Star Trek, there exists a field of negative energy, known as the Galactic Barrier. Later, when the Enterprise-D was thrown into a different galaxy, however, they did not experience the barrier. Such a barrier, to a society capable of warp travel, would seem to be a form of containment. Is it ever explained who (or what) made this barrier, and why?
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3Within the main canon, No. Within the EU, it was the Q.– ValorumCommented Jan 7, 2016 at 0:32
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You've linked to Memory Alpha in your question. What precisely are you wanting to know that isn't already covered?– ValorumCommented Jan 7, 2016 at 0:38
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@Richard If there's any info not found there. It's a wiki; it is likely outdated.– user40790Commented Jan 7, 2016 at 0:45
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1A quick glance at the wiki history indicates that it was updated only a few days ago, and pretty continuously since the page was created– ValorumCommented Jan 7, 2016 at 0:52
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3"most" of us find memory alpha, accurate and up to date. more so then the majority of other wikis out there. Especially if the excerpt from memory alpha tags the episodes its referencing– HimarmCommented Jan 7, 2016 at 1:35
2 Answers
In strict canon, nobody knows.
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.
I don't have the book or the story. Q pulled 'O' from another dimension, by using the Guardian of Forever. In the off-story, the Guardian fought against Q, telling Q that it was forbidden to bring beings from other dimensions into our dimension. Q fought hard and managed to pull 'O' through into our reality. 'O' is an old creature and walks with a limp; he also can't achieve anything close to light speed to get around.
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1This doesn't appear to add much useful information beyond that already supplied in Politank-Z's answer. Commented Aug 7 at 23:20