In recent years, a great deal of effort has been devoted to the study of the melting curve of elements at high pressure. This information is relevant, for example, for applications such as nuclear fission reactors that involve very high temperatures or very high pressures. Or to deepen the knowledge on the interior of planets. Understanding what happens to iron—and to other transition metals, such as niobium—in the interior of the Earth is fundamental for any geophysical model and opens the doors to a more precise global model for the study of the interior of planets.