Because it would likely be relatively small, most advanced equipment could only be recognized in the darkness of space when it comes close enough to our nearest lamppost, the sun. We can search for technological “keys” under this lamppost, but most of them will stay unnoticed if they pass far away. More fundamentally, one may wonder whether we are able to recognize technologies that were not already developed by us. After all, these technologies might feature subtle purposes—like the cell phone communication signals that a cave person would miss.
Is there something we might be missing already here and now? When looking around us, the most mysterious phenomenon we encounter routinely is the sophistication of complex life. Some scientists wondered whether life itself was seeded on Earth by an alien civilization in a process called “directed panspermia.” One can imagine a probe that brought the seeds of life in the form of microbes or instead a 3-D printer that produced these seeds out of the raw materials on Earth based on a prescribed blueprint. The universal left-handedness (chirality) of all life-forms on Earth without exception can be interpreted as stemming from a single panspermia event, be it natural (through a rock arriving from space) or artificial in origin . Even in this context, our imagination of what aliens might do will improve once we are able to produce synthetic life in the laboratory.
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