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A theoretical class of matter that violates one or more properties of normal matter as described by the Standard Model of [particle physics]. This isn't just weird stuff; it's stuff with properties like [negative mass]/energy density, which would cause gravity to repel rather than attract. While often purely [hypothetical], some forms (like matter with negative pressure) are used in cosmological models to explain dark energy or to theorize about warp drives and traversable wormholes. It's the "what-if" building material of advanced cosmology and sci-fi tech.
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