China’s new two-stage nuclear asteroid defense plan could offer a powerful new approach to protecting Earth from potentially catastrophic asteroid impacts. Researchers from the China Academy of Launch Vehicle Technology have proposed a two-stage mission in which a spacecraft first creates a deep crater inside a threatening asteroid before deploying a nuclear device into the cavity for detonation. Published in the journal Space: Science & Technology, the study suggests that this method could be significantly more effective than surface explosions, especially for large asteroids or those detected only weeks before a possible collision.

The findings come as scientists continue searching for practical planetary defense strategies against near-Earth objects capable of causing global devastation.

Scientists Propose a Two-Stage Nuclear Approach

The proposed mission differs from earlier concepts that relied on detonating a nuclear device near or on the surface of an asteroid.

• Under the new strategy, a spacecraft would first deploy a penetration device to excavate a deep crater.
• Once the cavity is created, a nuclear device would be guided into the crater before detonation.
• According to the researchers, placing the explosion beneath the asteroid’s surface transfers much more energy into the rock, making deflection or fragmentation substantially more effective.

The study focused on identifying the optimal burial depth, explosion size and impact conditions to maximize changes in the asteroid’s trajectory.

Key Findings from the Study

Researchers found that a nuclear explosion buried 30 metres below the surface could produce roughly three times the change in an asteroid’s speed compared with a shallow detonation.

Also Read: Global Warming Is Speeding Up, Scientists Report In New Study

Why Scientists Are Exploring Nuclear Deflection

Asteroids have shaped Earth’s history, with past impacts linked to major environmental disruptions and mass extinctions. Although space agencies monitor thousands of near-Earth objects, many large asteroids remain undiscovered, and warning times for potential impacts can sometimes be limited to only days or weeks.

Traditional asteroid deflection techniques, including NASA’s DART mission, work by altering an asteroid’s orbit through kinetic impact. However, researchers say these methods may not provide sufficient deflection for large asteroids hundreds of metres wide, particularly when little warning time is available.

The study argues that in such extreme scenarios, nuclear deflection may represent the only realistic option.

Also Read: Deforestation In Colombia Increased Slightly In 2025, Government Says

Deep Underground Detonation Shows Greater Effectiveness

China’s new two-stage nuclear asteroid defense plan demonstrated particularly promising results in computer simulations.

• Scientists estimated that an explosion with the energy of 200 Hiroshima bombs could completely fragment an asteroid measuring approximately 100 metres across.
• For even larger objects, such as kilometre-scale asteroids, a nuclear detonation inside a crater about 20 metres deep could increase the asteroid’s velocity by more than 30 centimetres per second, potentially altering its trajectory enough to avoid an Earth impact.
• The researchers also evaluated launch vehicle performance, impact velocity and crater depth to improve future mission planning.

Also Read: 2030 Commonwealth Games Will Lead In Sustainability And Accessibility: Harsh Sanghavi

Supporting Future Planetary Defense

The scientists emphasized that the research is intended to provide engineering guidance for future asteroid defense missions rather than propose immediate deployment.

As international efforts to strengthen planetary defense continue, the study adds another possible strategy for addressing high-risk scenarios involving large or short-warning-time asteroids. While any use of nuclear technology in space would require careful international coordination, the findings offer valuable insights into how humanity might respond if a major asteroid were ever found on a collision course with Earth.

Also Read: Nearly 64,000 Residents Evacuated As Wildfires Rage In Spokane, Washington