The Planet of Illusion
by Donald A. Wollheim
Broster shook his head. "There cannot be a question of letting unknown intelligences enter this craft or hold it. We can't afford to take chances, even if the notion that other world dwellers are necessarily enemies is silly. We've got to assume that everything we see is dangerous until proven harmless or friendly. Those are our first orders: do not surrender the ship."
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Space Opera