Most substances are made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and electrons. Inside the atom, electrons keep spinning around the nucleus. Both of these movements of electrons will produce magnetism. But in most substances, the direction of electron movement is different and chaotic, and the magnetic effects cancel each other out. So most substances are nonmagnetic under normal circumstances. Ferromagnetic substances such as iron, cobalt, nickel or ferrite are different, and their internal electron spins can be arranged spontaneously in a small range to form spontaneous magnetization regions, which are called magnetic domains. After the ferromagnetic substance is magnetized, the internal magnetic domains are arranged neatly and in the same direction, so that the magnetism is enhanced and a magnet is formed. The process of magnet absorbing iron is the process of iron block magnetization. Magnetized iron blocks and magnets have attraction between different polarities, and the iron blocks and magnets are firmly "stuck" together. Suppose the magnet is magnetic.

In other words, its magnetism is not given by the earth, but by the internal molecular current according to the viewpoint of ampere molecular current. So magnets are also magnetic in the universe. Electromagnetic force is one of the four basic forces in the universe, which is not affected by any external factors.

However, everything is not absolute. Because of its low gravity, the electronic structure of the magnet abandoned in space will change after being irradiated by strong cosmic rays or passing through the high temperature of the star, thus losing its magnetic force.