 Cohen and E.C.Hubbard at the Naval Surface Warfare Center Dahlgren Division discovered this in 1965.Although the resonance itself will remain stable in the short term, it becomes impossible to predict the position of Pluto with any degree of accuracy, as the uncertainty in the position grows by a factor "e" with each Lyapunov time, which for Pluto is 10–20 million years into the future.