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All it takes is some egotistical civilization that builds von Neumann replicators to build KILROY WAS HERE monuments made of diamond on every moon in the galaxy

All it takes is some egotistical civilization that builds von Neumann replicators to build KILROY WAS HERE monuments made of diamond on every moon in the galaxy (it's a big galaxy, but there's millions of years to play with). It's at least mildly surprising that there's no evidence of any extrasolar visitors in our solar system's past.

titzer 9y ago
I don't find it mildly surprising the space-fairing aliens practice leave-no-trace.
siidooloo 9y ago
This assumes von Neumann replicators are acheivable, and if they are, that any species capable of creating them would want to.