Desch et al. spherule-contamination critique.
competing-explanationanalysisThe Galileo Project
The formal scientific critique (Steve Desch et al.) that Loeb's IM1 'BeLaU' spherules are ordinary micrometeorites plus coal-fly-ash / laterite industrial contamination, not extrasolar technology.
The mainstream reading of the 2023 Pacific expedition spherules: ~78% resemble ordinary iron/chondritic ablation debris, and the anomalous Be/La/U signature matches coal-ash contamination. Concludes the 'interstellar spherules' claim is unsubstantiated and probably false.