The present book reviews the current state of the art in the area of a two cable-connected satellites system. The first part of the content describes equations of motion of a cable-connected satellites system. The second part describes condition regarding constrained motion of a cable-connected satellites system. The third part describes equilibrium positions of a cable-connected satellites system in circular orbit. The fourth part describes equilibrium positions of a cable-connected satellites system in elliptical orbit. The fifth part describes resonant oscillation of a cable-connected satellites system. The sixth (last part) describes non-resonant oscillation of a cable-connected satellites system.The book ends with general references related to the subject.