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If we were to accept that gravity is not attractive but acts as a pressure system, in other words manifests from the various particles and radiation out there "pushing" we perhaps would not need dark energy or dark matter...a clue may be that dark energy is seen as a form of gravity that is pushing and it is recognised as the major force .....drop the idea that a force of attraction exists and I suggest such an approach will explain the observations..particularly the perplexing rotation curves of stars that suggest the presence of additional matter that is required to get a model that essentially relies upon the notion that attraction exists to work..if one could construct a model that assumes gravity is essentially a "pushing" of particles and radiation I bet the need for dark matter would disappear.
It just seems unacceptably counter intuitive that there could exist so much matter that is hidden from us.
Alex
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