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I thought hopes of a warp drive were dashed last year by the discovery that antimatter doesn't fall up: https://bigthink.com/starts-with-a-bang/warp-drives-best

• JumpCrisscross 2y ago
  > thought hopes of a warp drive were dashed last year Requiring “negative mass/energy” only applies to superluminal warp drives. Those hopes were dashed long before. That article simply rejects one hypothetical approach to negative energy via antimatter.