Scientist models way to make sure no one’s violating the ban on nuclear weapons in space
A new study proposes a practical way to verify that no government or rogue actor is hiding nuclear weapons in orbit. MIT and University of Illinois researchers model how high-energy protons trapped in Earth’s magnetic field interact with fissile material, producing a neutron signal that nearby inspector satellites could detect. Their CubeSat concept—an 18-kg platform with off‑the‑shelf gear—could identify a thermonuclear weapon from about 4 km after roughly a week of observation. While promising, the team stresses that engineering proof-of-concept work is needed and many questions remain before such a system reaches high technical readiness. The aim is to inform policy and guide future research toward a space-based verification method under the Outer Space Treaty.