Scientists have identified a critical factor in using nuclear explosions to defend Earth from asteroid impacts: the direction from which the X-ray blast strikes the object’s surface. A study published in Icarus reveals that hitting different sides of an asteroid with intense radiation can produce vastly different results in terms of trajectory changes and rotational effects. According to researchers at Sandia National Laboratories, aiming differences can result in nearly fivefold variations in deflection velocity—the change in the asteroid’s forward speed—and even more dramatic differences in rotational effects.
To reach these conclusions, physicist Nathan Moore and his colleagues developed what they describe as the most accurate asteroid deflection model created to date. Their advancement overcomes a significant limitation in previous research: earlier computer models forced scientists to choose between accurately representing an asteroid’s complex, irregular shape and performing detailed calculations of physical forces involved. The new system combines both capabilities, enabling realistic simulations while maintaining the precision necessary for accurate predictions.
The researchers achieved this breakthrough by integrating two distinct simulation systems previously used for different types of physics problems. One code typically models high-energy experiments, while the other handles slowly-evolving forces. By combining these approaches, the team created an algorithm over 1,600 times faster than earlier models. This speed improvement proved essential, as existing computers lacked sufficient capacity to handle the complexity of analyzing realistic asteroid shapes alongside precise physical calculations.
The new model reconstructs asteroids using 3D images from spacecraft flybys and simulates nuclear X-ray bursts while adjusting explosion strength, distance, and radiation direction. The software calculates vaporization patterns, resulting trajectory changes, rotational effects, and surface damage. While significant challenges remain—including the inability to predict accurate fragmentation of entire asteroids—the research provides important guidance for future planetary defense missions. The findings emphasize that careful targeting could be crucial to successfully redirecting a threatening asteroid without fragmenting it into multiple hazardous pieces.
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