The alien weapon. Tucked within the planetesimal’s icy layers, the joint research group—Protogen and the Martian Naval Scientific Service—had found tiny reactive particles the size, roughly, of a midrange virus, but with a design structure and informational depth unlike anything Earth’s biosphere had ever imagined. The protomolecule, we called it, branding it immediately in a territorial move that irritated the Martian scientists. We ignored their protests as irrelevant.
