[extropy-chat] Dark matter and ET

[Dan Clemmensen]

There are many fundamental questions to which we currently have no 
scientific answers.

Two of the biggies:
1)  Dark matter: We have not been able to detect by other means enough 
matter
     to account for all of the gravitational effect we see in the cosmos.
2)  The Fermi Paradox: Why have we not detected signs of other 
intelligent life in
      the cosmos?

Perhaps these questions answer each other. Dyson spheres have been 
considered and rejected,
but Dyson spheres are not the only (or even most likely) end result of 
the evolution of
intelligence. For example, most SI might evolve to efficient 
computronium. What is
efficient computronium, and what is its emission signature? If it is 
difficult to detect, it may
comprise the missing mass.

def: computronium: matter organized to optimize computing capacity.
def: efficient computronium: computronium organized to optimize 
computations per Joule.

Does anyone have references to prior speculation on this topic?