U.S. Space Command chief General Stephen Whiting has publicly highlighted a grim scenario that America's newest military branch recently wargamed: an adversary detonating a nuclear weapon in space. While the notion may sound like science fiction, defense experts and intelligence officials are increasingly treating it as a credible and imminent threat.
House Intelligence Committee Chairman Mike Turner (R-Ohio) first raised alarms in February 2024 about Russia potentially placing a nuclear device in orbit. The Pentagon later confirmed that possibility, and the White House has since taken steps to address it. A December 2025 Executive Order on Space Superiority directs agencies to craft a space security strategy and a technology plan for detecting and countering adversary nuclear weapons in space, with the strategy due as soon as June 16.
This unclassified directive marks the first time the U.S. government has publicly ordered a response to a space-based nuclear threat. The American Foreign Policy Council, after a months-long investigation, echoes the gravity of the situation. “Space-based nuclear weapons are a serious matter, and one that deserves the very highest level of national attention,” the council's report states.
Unlike a ground-level detonation, a nuclear explosion in space wouldn't produce a mushroom cloud or level cities. But it could be equally devastating. A relatively small nuclear device detonated in low Earth orbit — where nearly 90 percent of modern spacecraft, mostly satellites, operate — would have catastrophic effects. The global economy, including the Internet, aircraft navigation, and ship tracking, depends on these systems to the tune of billions of dollars daily and trillions annually.
The U.S. military and intelligence agencies rely heavily on satellites for detecting adversary movements, tracking ballistic and hypersonic missiles, and communicating with forces abroad. The Space Force is developing capabilities to track everything moving in the skies or on the ground in real time, plus global weather monitoring. A nuclear blast in low Earth orbit would interact with the Earth's magnetic field, generating intense radiation that could destroy all satellites in that region within a week, leaving over 10,000 derelict objects on intersecting orbits with no way to avoid collisions. The resulting destruction would be massive, effectively a weapon of mass destruction in space.
Rebuilding these assets would be daunting. The U.S. lacks a stockpile of radiation-hardened military or civilian satellites to replace those lost. There is no proven technology for reducing harsh radiation in space, nor have investments been made to quickly and efficiently replenish low Earth orbit. The Department of Defense and intelligence community are expected to deliver an actionable plan by next week, or at least a starting point. Congress must be ready to fund it.
Experts recommend catalyzing investments in space traffic management models, commercial contingency agreements, radiation remediation technology, and radiation-hardened replenishment satellites. Long-term investments in an in-space industrial base above the threat are also critical. However, implementing such a plan will require sustained political will and resolute action from the U.S. government. Without it, the nation risks being left in the dark — literally and figuratively.
Peter A. Garretson, senior fellow in defense studies at the American Foreign Policy Council, and Richard M. Harrison, vice president of operations, co-authored the report. They stress that the threat is not hypothetical: the window for preparation is closing, and the stakes could not be higher.
