Are Space Explorations to Find Intelligent Extraterrestrial Life Logical?

Finding alien artifacts have long been carried out by researchers in hope to prove the existence of aliens somewhere in the outer space. However, some researchers suggest that human searches are not enough considering the vastness of space. Limited searches could imply that any remote unpiloted exploratory probes of alien origin would likely to stay undiscovered. Aliens would likely not detect human artifacts if they are the same as the latter either.

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