Chinese Study Outlines Nuclear Strategies for Deflecting Large Asteroids

A research team that includes members of the China Academy of Launch Vehicle Technology, Beijing Institute of Technology, and China Academy of Engineering Physics has modeled how a nuclear explosion could be used to protect Earth from asteroids >= 328 feet (100 m) in diameter. The authors describe two operational concepts:

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• Direct-rendezvous impact mode – a rocket carrying a kinetic impacter and a nuclear device strikes the asteroid at high speed, creates a shallow crater, and detonates the warhead inside the crater.

The nuclear option: Scientists reveal how atomic blasts could save Earth from asteroidsGizmodo

• Companion-flight pre-excavation mode – a rocket places a defense module in orbit, performs a flyby to select an optimal impact point, drills a deeper crater, and then detonates the nuclear device autonomously.

The nuclear option: Scientists reveal how atomic blasts could save Earth from asteroids

Both concepts are intended to either destroy or rapidly deflect the target, with modeling indicating effectiveness against objects up to a kilometer across.

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The study’s simulations used a virtual asteroid database covering a range of sizes and compositions. Results suggest that the pre-excavation mode provides stronger energy coupling, allowing the destruction of asteroids as large as 1 km in diameter, while the direct-impact mode remains viable for smaller threats. The researchers note that both modes could reliably neutralize asteroids under 100 m and offer “good defense effects” for larger bodies.

The nuclear option: Scientists reveal how atomic blasts could save Earth from asteroids

Lead author Wang Xiaowei and his colleagues emphasize that nuclear detonation delivers far more energy than kinetic impact alone, making it a viable fallback when short warning times preclude slower methods. They also acknowledge technical challenges, including the need for precise targeting and the risk of fragment debris reaching Earth.

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• “The results demonstrate that the flyby pre-excavation detonation mode, due to its ability to autonomously select the cratering location and achieve deep detonation, offers stronger energy coupling,” — the researchers

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• “using the enormous energy generated by nuclear detonation to directly destroy or rapidly deflect the asteroid’s orbit,” — the researchers

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• “The advantages of this mode include the ability to launch instantly, and the relatively simple system.” — the study notes

The nuclear option: Scientists reveal how atomic blasts could save Earth from asteroids

• “NASA SPACECRAFT SET TO INTENTIONALLY CRASH INTO AN ASTEROID TO HELP SAVE EARTH Some disadvantages include the complex systems needed, and the demanding capabilities needed for the rockets.” — the study notes

The nuclear option: Scientists reveal how atomic blasts could save Earth from asteroids