ArXiv Preprint Sets First Systematic Limits on Solar System Technosignatures

Lazio synthesizes data from five escaping probes, ground-based asteroid surveys, and lunar surface imaging to map search completeness as a function of heliocentric distance. The analysis treats both free-floating probes on bound or hyperbolic orbits and static surface artifacts, applying detection thresholds from existing optical, radar, and infrared datasets. This produces the first quantitative framework linking SETI concepts directly to planetary science mission archives rather than treating them as separate domains. The work explicitly connects to the Interstellar Probe concept in the recent Solar and Space Physics Decadal Survey.

Current limits remain crude: objects larger than several hundred meters could still evade detection in the outer Solar System and on airless bodies beyond the Moon. The paper identifies profitable next steps including targeted re-analysis of archived radar data from asteroid missions and high-resolution imaging from upcoming lunar and Mars orbiters. These steps would tighten bounds without requiring new hardware.

The approach corrects an earlier separation between SETI and planetary exploration by showing that technosignature searches can reuse existing mission datasets. It also flags the three known interstellar objects as calibration points for future anomaly detection pipelines.

Key limitation is reliance on archival sensitivity rather than dedicated surveys; a dedicated all-sky infrared or radar campaign with meter-scale resolution would strengthen constraints by orders of magnitude.