A new study indicates that a nuclear explosion could be an effective last-resort defense against a large asteroid heading for Earth, even when time is short. The research, covered by starlust.org and other outlets, suggests that a single 1-megaton blast could prevent the vast majority of a "city-killer" asteroid from striking the planet.
According to the reports, the study found that detonating a nuclear device near an incoming asteroid could break it apart or push it off course enough to eliminate most of the threat. Specifically, the modeling suggests that such a blast could stop 97% of the asteroid's mass from reaching Earth's surface, according to The Brighter Side of News.
The idea of using nuclear weapons for planetary defense has been discussed for decades, but this study appears to offer new data on how well it might work under tight deadlines. The scenario assumes that an asteroid is detected with only days or weeks of warning, leaving little time for more gradual deflection methods like gravity tractors or kinetic impactors. In those cases, a nuclear option may be the only viable response, the reports suggest.
Phys.org also highlighted the findings, noting that the approach could be a practical safeguard for a sudden threat. The study's results are based on simulations of a nuclear blast interacting with an asteroid's structure, though the specific details of the modeling were not included in the coverage.
The research adds to a growing body of work on how humanity might respond to an unexpected impact event. While no immediate threat is known, the findings could inform future emergency protocols for space agencies.
What to watch next: whether follow-up studies will test the approach against different asteroid compositions and sizes.
