[xelasnave]

Forget the pu****ron whatever I suggest there is enough energy out there to provide the energy for pressure. Consider the available energy at any point in interstella space it must be near infinite. Use the reverse approach to that used by Hersel to determine the energy out put of the Sun. We can assume energy comes from every direction from up to 14 billion light years away Android such is the case for every point in the Universe. To quantify the number of tradjectories divide the surface area of a sphere 14 billion light years by little windows say by the smallest measurement we know...select the smallest quanta of energy that exists and multiply by the number oftradjectories to find minimum energy at any point.
Does this near infinite energy invironment interact with matter is the question. I think it must and think the pioneer slow because they need only engage a small fraction of the energy that passes any point. The math is simple to do from what I set out above.
alex