On Sat, 3 May 2008 12:00:00 -0700 (PDT), Smooth John
wrote:

If cosmic radiation comes and hits from all directions, is there
any possibility that gravity is because the pressure from these
particles interacting more with metals and heavy particles?

Such an idea was considered in the past
http://en.wikipedia.org/wiki/Le_Sage's_theory_of_gravitation

But it proved not to be viable
http://en.wikipedia.org/wiki/Le_Sage's_theory_of_gravitation#Later_assessments

If this is the case, then gravity is not geometry and space-time
is a mokup and nothing else


I think your concerns might be addressed here.

Space and Gravitation
Reginald T.Cahill
http://www.mountainman.com.au/process_physics/HPS20.pdf