Jet engines are built to terrifyingly tight tolerances, yet the latest simulations on the world’s first exascale supercomputer suggest their biggest weakness may be measured in micrometers.

When you think of supercomputers, you probably think of vast air-controlled rooms crammed full of cabinets and illuminated by banks of flashing LEDs. The first Cray supercomputer, for instance, cost ...

A module of the first European exascale-class supercomputer, JUPITER, one of the four most powerful systems in the world, at Forschungszentrum in Jülich, Germany, on Sept. 5, 2025. (Rolf Vennenbernd / ...