The superstructure "Quipu," recently identified, spans 1.3 billion light-years, challenging our understanding of the ...

The Incas had a system of accounting that relied on the quipu. Cords of various colours were attached to a main cord with knots. The number and position of knots as well as the colour of each cord ...

To find Quipu, [astronomer Hans] Böhringer and his team analysed data from the German ROSAT X-ray satellite, looking at galaxy clusters several hundred million light years from Earth.