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Space travelers discover a planet that shows signs of a race that destroyed itself with advanced technology.

Explanation:

The question you have attached is related to the story of "The Gun" which was published in 1952. It was written by Philip K. Dic.k, an American writer. The central theme of the story focuses on a group of space travelers who discovered a planet. They crash landed on the planet because they were shot down. While they were investigating the surrounding area, they noticed an ancient city that was covered in ruins. They also noticed the gun that shot them and they came to know that it was placed there in order to protect the ancient city. As they finished repairing their spacecraft, they destroyed the gun and carried information about the ancient city. However, as they were about to leave the city, there were automated machines that repaired the gun. It was again reloaded. So, this means that it shot their craft once more, probably killing them all.

The story shows how destructive advance technology is for people. The ancient race tried to create the weapon as a means to protect themselves, but in the end, it killed the ancient race and also killed the present race. It will probably kill more races in the future.

So, this explains the answer.