this post was submitted on 26 Aug 2023
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More technically, the barn's immense mass cause positive Anti-de Sitter spacetime curvature locally. All light rays emitted from the barn are stretched as a result as they follow their world lines. In fact, barns further away are said to be expanding faster and faster. Some even speculate the expansion of the universe is increasing exponentially as a result of these barns. This is known as the Theory of Quantum Barn Gravity.