The Earth we know has one satellite, the moon, Mars has two satellites, Phobos and Deimos, Jupiter has five satellites, Saturn has eight satellites, while up to the present Uranus has been found to possess four, and Neptune one. There is, however, little doubt but that both Uranus and Neptune possess more than those already discovered, as it is inconceivable that Jupiter and Saturn, which are nearer to the sun, should possess a greater number of satellites by which the nights of the respective planets are illuminated, while the further planets, which need the increased lighting, because of the decreased intensity of the aetherial light waves at the increased distance, possess apparently a less number of satellites, and therefore less illumination for their respective nights. But what have these satellites to teach us as to the existence of the electro-magnetic aetherial currents that circulate round the planets? We have to apply a similar course of reasoning to the planets, as we have done in the case of the sun. If the sun is an electro-magnetic body, by its axial rotation it generates rotating Aether currents, and those Aether currents partake of the same rotation as the revolving body, that is, from west to east. In a like manner each planet, being an electro-magnet, generates electro-magnetic aetherial currents which also possess the same rotation as the planetary body which gives rise to them. So that if the planets rotate on their axes from east to west, the Aether currents will also rotate from east to west, but if the rotation of each planet is from west to east, then the rotation of the Aether currents associated with each planet will also be from west to east, with the result that each satellite will be carried round its primary planet by the circulating Aether currents in exactly the same way as the planet rotates on its axis.