On Earth, the dipole magnetic field that loops from the North Pole to the South Pole arises from convection in the planet’s liquid-iron outer core. Since Uranus and Neptune lack such a dipole field, ...
Diffractive robotics platform (A) 10×10 mm chip containing arrays of diffractive robots. (B) Close-up view of robots with varying sizes and numbers of panels. Scale bars, 50 µm. (C) False-coloured SEM ...