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Apr 4, 2022 at 15:58 vote accept th0bard
Mar 30, 2022 at 9:44 comment added D. Kovács The term "exotic matter" is overloaded. One type of exotic matter is matter with negative mass, but there are others, otherwise very good answer!
Mar 30, 2022 at 5:56 comment added Shufflepants In principle they could be made larger and kept open longer if we discovered and made use of matter with negative energy/mass, which is not ruled out by general relativity.
Mar 29, 2022 at 19:59 vote accept th0bard
Mar 29, 2022 at 20:19
Mar 29, 2022 at 19:41 history answered Tom CC BY-SA 4.0