sentences:  He reasoned that since Bell Labs designed communication equipment for ground applications, it had little incentive for keeping the weight down.Also, he was confident that his previous experience in guided missile design was more relevant for designing the control system for such a satellite and that the supposedly-complex control system the authors claimed would be necessary would not be needed.Rosen had an epiphany when it occurred to him that if he used spin-phased impulses on a spin-stabilized satellite, he could have a simple, long-lived control system to go along with the satellite's lightweight electronics.