Nuclear Blast Could Deflect Incoming Asteroids

The feasibility of using nuclear weapons to protect Earth from asteroid impacts has been investigated through advanced computer simulations. Researchers, led by Isaiah Santistevan at Lawrence Livermore National Laboratory, studied the effects of a 1-megaton nuclear weapon on a 160-meter-wide asteroid.

The simulations revealed that a nuclear explosion, even detonated several meters away, could significantly damage an asteroid. The immense X-ray energy released, comprising 70-80% of the explosion's output, can rapidly heat the asteroid's surface, causing material to vaporize and be ejected. This process could change the asteroid's speed and direction, offering a potential defense mechanism.

Further analysis showed that shock waves generated by the blast could cause the asteroid to crack or break apart. Simulations based on asteroid Bennu and real meteorites indicated substantial material damage and movement. Even a detonation 25 meters away demonstrated considerable damage over a short period, suggesting the X-rays' broad reach is critical.

However, these simulations are computationally intensive, limiting the analysis to brief moments of activity. The long-term consequences, including potential re-fragmentation or gravitational re-aggregation of debris, are not yet fully understood. Therefore, while nuclear disruption shows promise as a last-resort planetary defense strategy, it is not a definitive solution.