────────────────────── INTERSTELLAR OBJECT 3I/ATLAS BLIND SPOTS IN 3I/ATLAS MONITORING (what could let a hostile craft slip through undetected) Comprehensive Threat & Opportunity Brief Version 1.0  30 July 2025 ────────────────────── 1.  Executive Summary •  Object: 11 km interstellar comet on hyperbolic trajectory. •  Closest Earth approach: 1.8 AU (270 million km) on 19 Dec 2025. •  Current Bayesian posterior for any non-natural origin: 0.04 % (1 in 2 500). •  Critical observation window: 21 Nov – 5 Dec 2025 (Sun-occult manoeuvre). •  Decision horizon: 114 days from today. 2.  Four Canonical Scenarios   Scenario	Signature to Watch	Likelihood	Human Response  Natural Comet	Normal dust, red slope, no Δv	99.96 %	Scientific study only  Hostile Sterilizer	Sudden Δv ≥ 1 km s⁻¹, IR flare, EMP/energy beam	< 0.02 %	Kinetic intercept, EMP shielding, bunkers  Hostile Take-over	Sub-probe release, femtosat swarms, comms chatter	< 0.02 %	Laser bus, cyber hardening,...
 
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