A warp bubble—a boat that sails without oars: squeezed space in front, puffed it out back. Requires matter with an unheard-of feature: some parts are weighty, others lighter than emptiness. Hundreds of shells tested: a rupture always appears where matter meets void. Classical physics needs the exotic.
🎯 Tiny amounts of negative energy appear in the Casimir effect: two plates in a vacuum attract each other, as if there is less energy between them than in complete emptiness.
🎬 In Star Trek, warp drives conquer galaxies, but reality is harsher: even a static bubble would require matter that hardly exists.