The real reason why the Pioneer spacecrafts appear to be slowing down

Back in July we reported on a new theory explaining why both Pioneers 10 and 11 were decelerating at a rate that seemed to defy Newtonian physics. The answer, it seemed, had to do with heat from the electrical subsystems and the decay of plutonium which was pushing back on the craft. But now, a researcher from the… » 10/10/12 6:40am 10/10/12 6:40am