Overview
- The Nature paper by MIT researcher Areg Danagoulian, published Wednesday, lays out a physics-based feasibility case showing that high-energy protons in Earth’s radiation belts would cause uranium or plutonium to emit neutrons that a nearby detector could pick up.
- Danagoulian proposes a compact 'inspector' satellite that uses diamond layers, neutron-sensitive scintillator pixels and direction-sensitive detection to filter charged-particle noise and trace neutrons back to a target spacecraft.
- Modeling in the study indicates a detector could identify a thermonuclear weapon with about 99 percent accuracy if an inspector stayed within roughly 4 kilometers for about a week, with detection time falling to hours if sensors approach closer or multiple inspectors operate together.
- Experts and the author stress this is a conceptual, modelled system that needs engineering development, real-world tests, collaboration with national labs, and solutions for rendezvous mechanics, radiation backgrounds and collision risks before any deployment.
- The proposal aims to fill a long-standing verification gap in the 1967 Outer Space Treaty and arrives against worries about suspicious satellites such as Russia’s Cosmos2553 and the broader risk that a space detonation would cripple satellite networks and services.