How can a planet or star produce a magnetic field?

A planet or star can produce a magnetic field through the movement of electrically conductive fluids within its interior, a process known as the dynamo effect. For planets like Earth, this occurs in the liquid outer core, where the motion of molten iron creates electric currents that generate a magnetic field. In stars, the convective movements of plasma and the rotation of the star contribute to the creation of complex magnetic fields. These magnetic fields can influence the behavior of charged particles in their vicinity, leading to phenomena such as solar flares and auroras.