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The controlled production, containment, and utilization of antimatter as an energy source or propellant. When matter and antimatter annihilate, 100% of their mass is converted to energy (E=mc²), making it the most energy-dense reaction known to physics. The monumental challenges are producing enough of it (it's incredibly rare and [expensive] to make) and storing it (it annihilates on contact with normal matter, requiring [electromagnetic] "bottles" in a perfect vacuum). If mastered, it would enable [interstellar travel] and immense power generation.
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