[nik61]

As a visitor here from one of the supercivilizations in question (and enjoying the sex, red wine and rock music, I must say) I feel I have to point out a couple of things that may have been missed. One is that many of you are spending a lot of time looking for 'dark matter' when clearly the shrouded Dyson spheres are fulfilling that role in their great abundance - talk of infra-red signatures and such-like is technical defeatism. Secondly if you find a way of getting at other dimensions in the multiverse, then you can find one soon enough that consists largely of energy and funnel some of it back to your own locale. Take your pick.