JuMBOs as Technosignature Platforms: Observable Predictions for 2030

Abstract Jupiter-Mass Binary Objects (JuMBOs), discovered by JWST in the Orion Nebula Cluster (Pearson & McCaughrean 2023), exhibit an anomalously high binary fraction (8-9%) compared to theoretical predictions (<1-2%). We propose that a subset of these objects may represent artificially modified platforms optimized for post-AGI civilization stealth operations. This hypothesis integrates astrophysical observations, AGI existential risk frameworks, and engineering feasibility analysis to generate testable predictions for 2030-era instruments. The Roman Space Telescope and Extremely Large Telescope will provide definitive tests through: (1) persistent wide-binary excess in field populations, (2) thermal signatures exceeding natural cooling models by 50-100 K, and (3) deuterium depletion in atmospheric spectroscopy. If confirmed, P(artificial modification) crosses 50%; if null, the hypothesis drops below 10%. This single, instrument-timed test renders the theory maximally falsifiable within the current decade. Regardless of outcome, the framework demonstrates how contemporary astrophysical anomalies can generate rigorous technosignature hypotheses with near-term observational resolution. Critical Updates: Portegies Zwart & Hochart (2025) - New additions covering the Nature Astronomy finding that the ejection mechanism cannot produce wide JuMBOs in clustered environments (dissociation outpaces formation), why this is significant (comes from the same group that did the original N-body simulations), the implications for the formation puzzle (both leading natural mechanisms now have fundamental difficulties), and what it means for the artificial hypothesis (strengthens the Bayesian case, makes the 2030 Roman/ELT observations even more critical). Sensitivity table updated, new row added for "Portegies Zwart & Hochart (2025): Ejection mechanism ruled out in clusters" with a +3–6% posterior boost. Net posterior updated from 14% → 23–34% (was 20–28%), delta updated from +6–14% to +9–20%. Summary paragraph rewritten to highlight the significance. All probability references throughout the document updated from 20–28% to 23–34%. See also -- JuMBOs as Potential AGI Stealth Platforms Supplementary - Appendices A, C, and D; and Sensitity Analysis: JuMBOs Artificial Hypothesis.