On a distant planet, not too different from Earth, there stands a mechanized city with no visible inhabitants. Obviously of a highly developed civilization, the question is, who built it, where are they. and what can humans learn from them?
On a distant planet, not too different from Earth, there stands a mechanized city with no visible inhabitants. Obviously of a highly developed civilization, the question is, who built it, where are they. and what can humans learn from them?