Asteroid Deflection Efficiency Varies Fivefold
A nuclear explosion in space could serve as humanity’s last defense against an asteroid on a collision course with Earth, but new US research shows the deflection effect can vary nearly five times depending on which side of the asteroid is struck. Researchers at Sandia National Laboratories developed an advanced computer model to calculate how an asteroid reacts to radiation from a nuclear blast, ScienceDaily reported November 8.
The findings were published in the scientific journal Icarus and covered by ScienceDaily. Researchers found that the asteroid’s irregular shape dictates the outcome of any deflection attempt. In one simulation, an asteroid changed speed by 3.9 millimeters per second when X-rays hit from one direction, compared to just 0.8 millimeters per second from another angle.
Nuclear Radiation Mechanics Replace Hollywood Explosions
Hollywood films often depict atomic bombs blowing asteroids into tiny pieces, but researchers note that destroying a large asteroid can create multiple dangerous fragments still heading toward Earth. The explosion releases intense X-rays that heat the surface, causing material to vaporize and stream into space to create a rocket-like thrust.
Research lead Nathan Moore said that while the team expected direction to matter, they were surprised by the magnitude of the difference. The study found that changes in rotation speed varied by a factor of 17 depending on the irradiated side. The goal of the proximity blast remains altering the trajectory just enough to ensure the space rock misses Earth.
Faster Computer Models Map Complex Shapes
Previous simulation models treated asteroids as roughly spherical objects to simplify calculations, but real asteroids feature irregular shapes with mountains, depressions, and sharp edges.
Even small velocity adjustments can accumulate over time if an asteroid is discovered years before a potential impact. A speed change of one millimeter per second translates to roughly 31.5 kilometers over a single year, provided the thrust acts in a favorable direction without later gravitational interference.
Questions Remain on Real-World Application
Despite the modeling breakthrough, researchers emphasize that the method cannot yet predict with certainty whether an entire asteroid would break apart during a deflection attempt. Precise placement of a nuclear charge relative to a fast-moving space object remains an immense engineering hurdle, and obtaining sufficiently detailed three-dimensional images of a late-discovered threat poses additional challenges. The simulation results have not yet been tested on an actual celestial body.
Questions About Asteroid Simulation Results and Deflection Effects
Where were the asteroid simulation results published?
The findings were published in the scientific journal Icarus and featured by ScienceDaily on November 8, 2026, based on research from Sandia National Laboratories.
How much can an asteroid’s deflection effect vary based on strike location?
Simulations showed that velocity changes can vary by a factor of nearly five, while rotational speed changes can vary by a factor of 17, depending on which side of the irregular asteroid receives the X-ray radiation.
Why do researchers avoid direct nuclear impacts on asteroids?
Directly destroying a large asteroid can create multiple dangerous fragments that remain on a collision course with Earth, which is why scientists favor a proximity detonation that uses vaporized surface material to push the object off course.
How fast is the new simulation algorithm compared to older methods?
The newly developed computer model is more than 1,600 times faster than previous calculation methods that treated asteroids as simple, round objects.
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