China has unveiled a new orbital defense simulation demonstrating that a nuclear explosion roughly 200 times more powerful than the Hiroshima atomic bomb could destroy a potentially hazardous asteroid, according to research from the China Academy of Launch Vehicle Technology.
Understanding Near-Earth Objects and Impact Threats
Asteroids are rocky remnants left over from the formation of the solar system about 4,6 miliar tahun lalu, according to NASA data. Objects with orbits that bring them close to Earth are classified as Near-Earth Objects (NEOs). These are defined by NASA as objects orbiting within roughly 30 juta mil (48 juta kilometer) of Earth’s orbit, which equals about one-third of the distance between Earth and the Sun.
Within that group, NASA designates a subset as Potentially Hazardous Asteroids (PHAs). An asteroid earns this label if its orbit approaches within approximately 4,6 juta mil (7,5 juta kilometer) of Earth’s orbit and its diameter measures about 460 feet (140 meters) or larger. Size dictates the scale of the disaster:
- 10 meters: Generates a bright fireball and a shockwave capable of shattering glass, according to NASA.
- 50 meters: Causes localized damage on the ground.
- 140 meters: Produces a massive crater and widespread casualties across a broad region.
- 1 kilometer: Triggers global-scale destruction.
- 10 kilometers: Leads to planetary mass extinction.
How China’s Nuclear Simulation Works
To mitigate these catastrophic risks, researchers led by Xiaowei Wang at the China Academy of Launch Vehicle Technology tested nuclear deflection and destruction strategies via computer simulation. The proposed method requires two spacecraft working in tandem. First, a high-speed metal penetrator strikes the asteroid’s surface to carve out a deep cavity. Next, a second spacecraft delivers a nuclear device directly into that newly formed hole.
Placing the warhead beneath the surface ensures that the surrounding rock absorbs significantly more explosive energy rather than venting it harmlessly into space. According to the research team, this subsurface detonation yields far greater destructive power than a surface blast. Simulations revealed that a 3-megaton nuclear device—equal to roughly 200 Hiroshima bombs—could completely shatter an asteroid measuring about 100 meters in diameter.
Did you know?
Placing a nuclear device roughly 30 meters beneath an asteroid’s surface increases the resulting velocity change by more than three times compared to a detonation right near the surface, according to the China Academy of Launch Vehicle Technology study.
The Future of Planetary Defense Strategies
While the findings remain confined to computer simulations, the research team positions the subsurface nuclear approach as a vital emergency option for planetary defense. Traditional kinetic impactors and conventional deflection methods may fall short when humanity faces exceptionally massive near-Earth objects. Space agencies worldwide continue to model these high-stakes scenarios to refine deflection timelines well before an actual intercept becomes necessary.
Frequently Asked Questions
What makes an asteroid a Potentially Hazardous Asteroid (PHA)?
According to NASA, an asteroid is categorized as a PHA if it comes within 4,6 juta mil of Earth’s orbit and has a diameter of at least 460 feet (140 meters).
Why detonate a nuclear device beneath the asteroid’s surface?
Simulations show that a subsurface blast forces the surrounding rock to absorb more explosive energy, maximizing destruction compared to a surface-level detonation.
Who led the recent asteroid simulation study in China?
The research was led by Xiaowei Wang at the China Academy of Launch Vehicle Technology.
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