Anyone Remember Von Neumann Machines?
The article doesn't show much imagination. With only a little more wishful thinking, we could send primitive Von Neumann machines that would not only build the solar cells, they would also build more of themselves. Physicist Frank Tipler extrapolates that the absence of such devices answers Fermi's paradox, inferring that "We are the only intelligent life within a billion light-years." Otherwise we would be knee deep in the little buggers. Of course, Von Neumann machines can be dangerous.