A new study argues that humanity has barely begun to search for extraterrestrial probes that might be hiding in our own cosmic backyard. The research notes that despite our advanced telescopes and orbital assets, we have only conducted a superficial scan of the solar system for signs of alien artifacts.
The argument builds on a simple reality: humanity itself, still in its technological infancy, has sent five probes—Pioneer 10 and 11, Voyager 1 and 2, and New Horizons—on escape trajectories out of the solar system. Though these craft will be long dead before reaching another star, they prove that interstellar probes are not only possible but inevitable for any spacefaring civilization.
None of these five robotic explorers will remain operational by the time they enter another star system, the study acknowledges. Yet their very existence underscores a provocative point: if we can do it, others likely have too. The probes serve as a proof of concept for civilizations far older and more advanced than our own.
The authors suggest that extraterrestrial probes could be lurking in places we rarely examine—such as the asteroid belt, the Kuiper belt, or Lagrange points where gravity is balanced. We may have simply been looking in the wrong places, or not looking hard enough.
Counter-argument: Critics caution that this reasoning relies heavily on anthropomorphism—assuming alien civilizations would behave similarly to humans. The probes could also be undetectable, or simply not exist, and the proof-of-concept analogy does not guarantee that any have actually arrived in our system.