This is a summary of our current knowledge of key planetary parameters.
Many important issues remain unresolved.
The nature of Pluto's interaction with the solar wind is completely unknown. The two critical quantities that define the nature of Pluto's interaction with the solar wind are the degree of magnetization of the planet and the atmospheric escape rate. Whi le it is not considered likely that Pluto has an active internal magnetic dynamo, it is possible that some remanent magnetization is present. Because of the weak solar wind, even weak magnetization could produce an appreciable magnetosphere. Charon probably lacks both sufficient atmosphere and sufficient conductivity to have a significant effect on the plasma in which it is embedded and simply absorbs the impinging solar wind or magnetospheric plasma.