Usual neutrinos or dark matter won’t work, but if we go to the extremely speculative realm, there might be some “hidden sector” of matter that doesn’t normally interact with ordinary matter but allows complex structure. Producing it and doing anything with it would be very hard, but not necessarily impossible.
Usual neutrinos or dark matter won’t work, but if we go to the extremely speculative realm, there might be some “hidden sector” of matter that doesn’t normally interact with ordinary matter but allows complex structure. Producing it and doing anything with it would be very hard, but not necessarily impossible.