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Thank you Kath and Doug for your interest and input.
One can think as the pressure come from everywhere it must achieve an equilibrium however the "stuff" making up this pressure is traveling at C movements of bodies will constantly be mixing the contents of the barrel.. as the Moon travels across the sky it is pushing thru this pressure and now doubt the constant change prevents an equalibrium being achieved.
And remember that the coming from everywhere thing literally applies everywhere ..that is hard to comprehend.. Think of what stars you see at a particular place and mental move to others you see the same stars..they each castenrgy to each and every part of the Universe they touch. Look at one of my wide field shots, each star,each point of light is the centre of a many layered sphere of light extending out to space for billions of light years (ok so there are young stars as well) and as full of stars as those shots display the number of stars in the Universe number many billions fold. Yet at anypoint light from each object passes thru the selectedl point .. and perhaps an underlying "pressure" a "gravity rain" that falls everywhere in creation.I one were to sample the light travelling thru the sparsest part of space, it will contain a sample of all photons from every where.. (some will not have reached that point but I hope you can see the picture in its enormity and complexity from trying to mental put all this in a box...just think of the objects billions of years old whose light has passed that point for billions of years)
Thanks again
alex
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