Quipu is a large-scale superstructure of galaxies of the Universe, a wall of galaxies or galaxy hypercluster composed of knots of galaxy clusters. As of 2025, it is the largest known structure in the Universe, some 1.3 billion light years long (1.3×10 light-years (7.6×10 mi; 1.2×10 km)); and the most massive known structure, containing 2×10 solar masses (4.0×10 kg; 8.8×10 lb; 4.0×10 t),or about 200,000 times the mass of the Milky Way.
The structure was discovered by Hans Böhringer and colleagues using data from the ROSAT X-ray satellite, and described in a 2025 paper on arXiv. It was named "quipu" as it is reminiscent of the Andean knotted textile called quipu that Böhringer had seen in a museum near Santiago, Chile, while he was working at the European Southern Observatory.
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