Deep detonation might be our best shot at stopping asteroids
In short: When a massive asteroid heads for Earth, simply smashing it isn't enough. New research suggests that to truly deflect a large threat, we may need to burrow into the rock first. Scientists are now modeling how to trigger 'deep detonations' to shift an asteroid's path effectively.
The challenge of planetary defense lies in scale. While NASA successfully used the DART spacecraft to alter the orbit of the 160-meter-wide Dimorphos in 2022, that was a unique test case. For asteroids exceeding 330 feet (100 meters) in size, traditional kinetic impacts or long-term force deflection offer limited energy and cannot achieve effective results within short timeframes.
Two distinct 'defense modes' were suggested for these massive hazards by a group headed by Xiaowei Wang of the China Academy of Launch Vehicle Technology. The first is a simple impact detonation, where a nuclear device creates a shallow crater on the surface. The second, more complex method is a 'pre-excavation detonation.' This involves using a penetration device to create a deep crater before exploding a nuclear warhead inside the asteroid's interior.
Modeling these scenarios against a virtual threat database—assuming warning times of one to 20 years—suggests that the deep-crater method is superior. By detonating inside the rock, the energy can more effectively change the asteroid's velocity. This research highlights a shift from 'smacking' rocks to precisely engineering their internal physics.
Simultaneously, Japan's JAXA is testing the precision required for such missions. The Hayabusa2 probe recently performed a high-speed flyby of the asteroid Torifune, coming within 800 meters (0.5 miles). Moving at over 18,000 kilometers per hour, the mission tested whether scientists could precisely control a probe's trajectory to perform a deflection if necessary.
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Sources
- Summary by Intellect · source: Can We Really Stop an Asteroid? New Data from Japan & China
- Also: Chinese scientists find the best way to nuke an asteroid on its way to impact Earth
- Also: phys.org — Japan space probe skims asteroid in test for planetary defense
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