> Matter with negative mass has never been observed before, making it purely theoretical.
It's worse than merely theoretical because the theories we use to describe reality at present don't give us any reason to believe such exotic matter must exist, and there is no empirical evidence for such matter existing.
But slice it anyway you like, the Navy isn't operating these and there is no theoretical basis for explaining the sort of antigravity craft that UFOologists claim these Navy videos show. They aren't Alcubierre drives, that is simply absurd.
It's worse than merely theoretical because the theories we use to describe reality at present don't give us any reason to believe such exotic matter must exist, and there is no empirical evidence for such matter existing.
But slice it anyway you like, the Navy isn't operating these and there is no theoretical basis for explaining the sort of antigravity craft that UFOologists claim these Navy videos show. They aren't Alcubierre drives, that is simply absurd.