NASA's chief and Elon Musk are exploring antimatter propulsion—a theoretical technology that would harness matter-antimatter annihilation to create thrust far beyond current rockets. According to io9, the appeal is obvious: this could unlock human exploration of the galaxy. The obstacles? Producing antimatter in useful quantities costs trillions of dollars per gram, safely containing it requires technology we don't yet have, and the physics of actually powering a spacecraft with it remains largely theoretical. For now, it's a dream that may stay on the drawing board.

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