The foundation of science is based on the humility to learn, not the arrogance of expertise. When comet experts argued that the interstellar object 3I/ATLAS must be a familiar water-rich comet as soon as it was discovered in July, they behaved like artificial intelligence systems: only able to reflect the data sets they were trained on. For decades, the data set that established comet expertise largely comprised icy rocks in the solar system. My counterpoint is simple: humanity launched technological objects into space, so we must conclude that alien life forms could do the same. This possibility must be added to the training data set of comet experts when studying interstellar objects.

To illustrate why, consider the following: on 2 January 2025, the Minor Planet Center – officiated by t

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