The planet known for having a very strong magnetic field is **Jupiter**. It has the largest and most powerful magnetic field of any planet in the solar system, which is 20,000 times stronger than Earth’s. This magnetic field is generated by the motion of metallic hydrogen within Jupiter's interior, which creates dynamo effects. Jupiter's magnetic field traps a vast amount of charged particles, forming its intense radiation belts. Additionally, it influences the magnetospheres of its many moons, contributing to fascinating phenomena such as auroras and volcanic activity on some of them.