A Solar System Littered With Alien Artifacts? : Discovery News: "As powerful space telescopes seek out Earth-like planets, and SETI radio telescopes listen for transmissions from aliens, physical evidence for intelligent extraterrestrials might be right in our backyard.
I'm not talking about flying saucers or oddball ancient artifacts attributed to visits by so-called "space gods," however. Instead, I'm looking for something as mundane as the pieces of interstellar probes that could have visited our solar system on numerous occasions over geologic time."
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