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Assume wormholes exist: one hole allows matter to pop out of another hole somewhere else in the universe.

If one end of the wormhole is swallowed by a black hole then no information can get from that end to the other hole.

If the wormhole acts as some kind of gateway to another part of the universe wouldn't that mean that the ENTIRE universe would be swallowed by the blackhole? ie. the wormhole end is an entry portal to the entire universe, so if that is inside the blackhole, wouldn't that mean the entire universe is then in the blackhole?

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We need a speculative tag. –  HDE 226868 Jan 6 at 16:00
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I don't see any problem with this post compared to most others... Sure, it's speculative, but does that mean that there shouldn't have been questions about BHs if SE existed before the 90s? If you downvote; please leave a comment to explain why. –  DilithiumMatrix Jan 6 at 22:01
    
what is a speculative tag –  Oliver Watkins Jan 6 at 23:07
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@zhermes I didn't downvote; I thought about voting to close. I'll leave a comment nonetheless. I think this should be closed because we don't know if wormholes exist, or how one would interact with a black hole. Answering this properly would require a long answer with general relativity - although you did a good job answering. Oliver Watkins - I meant a tag for things like this that rely on speculative concepts. –  HDE 226868 Jan 6 at 23:09
    
@HDE226868 Didn't Einstein predict wormholes? If you're being nitpicking - we don't even know that black holes exist. For all you know, we're all being emulated inside a computer. –  frodeborli Jun 8 at 7:43

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The concept of a wormhole is, of course, highly speculative. None the less, such a phenomenon could take many forms - most simple something which to outside observers looks like a blackhole on each end of the wormhole. Alternatively, a traversable wormhole (see for example Morris & Thorne 1988; which has the same basic topology but no horizon), could still behave for the most part* like a normal, massive object.

In either case, if one end were 'swallowed' by a blackhole, it is unclear to me whether it would remain stable (i.e. remain a wormhole). In the case of a non-traversable wormhole, if it remained stable, it would continue to look like a blackhole on each end --- one end of which now merged with another blackhole, and subsequently more massive. A traversable wormhole on the other hand could (extremely hypothetically) still remain traversable if there were enough exotic matter, or it could retain the horizon from the blackhole it merged with and be no-longer traversable.

All wormhole metrics that I've seen are more or less symmetric, and thus either have no horizon, or horizons on both ends... I don't think it would be possible to have a horizon on only one side --- allowing something to fall into an apparent blackhole on one side, and come out of a wormhole on the other. Even so, however, remember that a blackhole isn't a magic vacuum --- and wouldn't 'suck in' the 'entire universe'.

*A traversable wormhole is believed to require some sort of 'exotic matter' in the neck, which may behave somewhat differently...

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I don't think you can differentiate between the two ends of a wormhole. Both ends would be the same - i.e. it's non-orientable. If there is a black hole next to a wormhole, would not the gravitational effects of the other black hole also work through the wormhole itself? –  frodeborli Jun 8 at 7:51

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