“…In the 1960s, space physicists devoted a good deal of attention to the natural torques acting on spacecraft, with the hope of controlling their attitude without active propulsion systems; for example, by activating magnets inside a spacecraft orbiting in the magnetic field of the Earth one could control its attitude [Wilson, 1959[Wilson, , 1960[Wilson, , 1964Hecht and Manger, 1964]. Colombo investigated the rotation of Explorer XI and studied the torques induced by the gravitational gradient [Colombo, 1964] and by permanent magnetization with hysteresis effects [Colombo, 1967].…”