Physics on a plane: Helium crystals grown in zero gravity - Physicists from Japan have taken to the skies to grow crystals in zero gravity. Helium crystals were grown using high pressures, extremely low temperatures (0.6K/-272°C) and by splashing them with a superfluid -- a state of quantum matter which behaves like a fluid but has zero viscosity, meaning it has complete resistance to stress. Superfluids can also flow through extremely tiny gaps without any friction.(10.1088/1367-2630/14/12/123023)

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