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A comment on How Can a Star Be Older Than the Universe?. Parent comment

Re:How Can a Star Be Older Than the Universe? by namirez on Wednesday October 16, 2019 @07:42PM (#21277349)
Yes, it's called Alcubierre Drive, where spacetime is compressed in front and expanded behind a ship to drive it through the spacetime like a gravitational wave.

https://en.wikipedia.org/wiki/Alcubierre_drive

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Re:How Can a Star Be Older Than the Universe? by Filligree on Wednesday October 16, 2019 @09:38PM (#21278173)
Or the Krasnikov tube, where time is tilted such that travel through it (in one direction) takes you back in time (from a stationary perspective).

That's very similar to a wormhole, but without the topological flaw.

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