Flexi Says: Earth's magnetic field is created by the movement of molten metal in the outer core. Venus does not have a magnetic field like Earth does because Venus lacks the movements of molten metal in the core. This is due both to the extremely slow rotation of Venus (only one turn every 243 Earth days!) and also to the lack of enough internal heat to generate convection in the molten core. As such, Venus doesn't have a measurable global magnetic field that is generated from inside the planet. However, a very weak magnetic field around Venus is generated by the solar wind interacting with the ionic particles in its atmosphere.