# Using cosmic protons to verify the Outer Space Treaty

Researchers have proposed a new method to verify compliance with the Outer Space Treaty by detecting cosmic protons that interact with nuclear materials. The technique could passively identify covert nuclear weapons or reactors in orbit without requiring onboard sensors. This development matters because it offers a non-intrusive way to strengthen space security and arms control.

**Importance:** 3/5

## Sources

### Science
- [Nature](https://www.nature.com/articles/s41586-026-10783-2) — 2026-07-08