Electron stars were the compacted remnants of the cores of giant stars and the result of gravitational collapse. They were made up of electrons and occurred when, instead of protons and electrons being destroyed to form a neutron star, neutrons and protons were destroyed, leaving only the electrons. The electron material was unstable due to the extreme repulsion between the particles and often, the gravity of the remnant was not strong enough to hold them together, causing the star to vibrate and sometime change shape. Electron stars were incredibly magnetic, and often attracted metallic objects from far away through their magnetism as well as their gravity. When electron stars collided with proton stars, they formed magnetic stars.