Chinese scientists have proposed a new planetary defense concept aimed at more effectively deflecting or destroying potentially dangerous asteroids. Instead of traditional surface nuclear explosions, the new approach involves detonating a charge inside a pre-created cavity within the object's body.
Mechanism of Action
The study, conducted by researchers from the China Academy of Launch Vehicle Technology (CALT) led by Xiaowei Wang, describes a scheme called "post-cavity formation detonation mode during flyby." The process requires the use of two unmanned spacecraft.
In the first phase, a heavy metal impactor crashes into the asteroid to create a crater up to 30 meters deep. After a few seconds, a second device inserts a 3-megaton nuclear charge into the resulting cavity and detonates it. According to the developers, the power of such a charge is equivalent to about 200 atomic bombs used over Hiroshima.
Comparison with Current Methods
According to the team's calculations, this method significantly increases energy transfer to the asteroid and can destroy objects with a diameter of about 100 meters. Traditional methods, such as kinetic impact or gravity assist, are only effective with decades of warning, whereas the proposed scheme is more suitable for short notice.
Compared to NASA's DART mission in 2022, the new design is more than three times more effective than a detonation at a depth of 10 meters and about 110 times more effective than the velocity change achieved by DART. Researchers point out that the nuclear charge provides a much higher energy transfer for trajectory alteration.
Technical Challenges
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Despite the concept's potential, scientists emphasize that its practical implementation is accompanied by serious technical difficulties. Delivering heavy impactors and nuclear warheads to distant asteroids will require the deployment of extremely powerful launch vehicles capable of transporting large payloads into deep space.