As the Earth orbits the sun, it shares its path with numerous small celestial bodies, known as Near-Earth Objects (NEOs). Currently, there are approximately 37,000 known Near-Earth Asteroids (NEAs) and 120 known short-period near-Earth comets (NECs). While astronomers believe the total number of these objects could reach into the millions, a subset known as Potentially Hazardous Objects (PHOs) poses a particular concern due to their potential impact risk.
Although scientists are confident that no known PHOs will threaten Earth in the next century, the need for planetary defense measures is becoming increasingly apparent. In 2022, NASA’s Double Asteroid Redirection Test (DART) successfully demonstrated a kinetic impactor method by altering the orbit of the asteroid Dimorph. To enhance the reliability of such methods, researchers must understand how asteroid materials behave under extreme conditions.
Innovative Testing at CERN
A recent study led by an international team utilized CERN’s High Radiation to Materials (HiRadMat) facility to investigate the resilience of iron meteorites, specifically the Campo del Cielo sample. The researchers subjected this meteorite to 440 GeV proton beams to simulate the stress experienced during atmospheric entry.
Using Doppler vibrometry, the team measured minute surface vibrations in real-time, capturing how the meteorite responded to the escalating stress. The findings, published in Nature Communications, revealed that M-type asteroids can absorb significantly more energy without fragmenting, and intriguingly, they may even become tougher under stress.
Unexpected Energy Dissipation
One of the most surprising outcomes of the study was the meteorite’s ability to dissipate energy more effectively as stress increased. This suggests that the internal structure of asteroids can redistribute and amplify stress in ways that conventional models do not account for, resembling the behavior of complex composite materials.
Moreover, the research indicates that energy can penetrate deep within an asteroid without causing it to break apart, challenging previous assumptions about meteorite behavior during atmospheric entry.
Implications for Planetary Defense
As noted by study co-author Professor Gianluca Gregori from the University of Oxford, this research marks a significant advancement in understanding asteroid material behavior. Previously, scientists relied on simulations and static laboratory tests. This study provides real-time, non-destructive observations of how meteorite samples deform and adapt under extreme conditions.
The results address a critical challenge in planetary defense research: reconciling the differences between meteorite breakup observations in Earth’s atmosphere and laboratory strength measurements. The findings suggest that the internal stress redistribution within meteorites could explain these discrepancies, potentially leading to more effective asteroid redirection strategies that maintain the integrity of the objects.
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
