With Earth impact odds now slim, attention has shifted to a ~4% chance the asteroid could hit the Moon — a collision that could eject debris and endanger satellites and spacecraft.

Researchers and planetary-defense planners are urgently studying options — including nuclear disruption — to prevent asteroid 2024 YR4 from colliding with the Moon in December 2032. Updated tracking has all but ruled out an Earth strike, but a potential lunar impact would still pose serious risks to near-Earth space infrastructure.

Current assessment: low Earth risk, higher lunar concern

Since its discovery in December 2024, scientists have updated orbital solutions for 2024 YR4 as more observations accumulated. Those refinements have reduced the chance of an Earth collision to near zero, but certain trajectories still leave roughly a 4% probability the object will strike the Moon in late 2032. That statistical tail — while small — is driving renewed planning.

Why a moon strike matters

An impact on the lunar surface could blast large quantities of regolith and rock into space. Models show a powerful strike could loft fragments and dust that intersect Earth’s orbital environment days to weeks after the event.

• Satellite hazard: High-velocity lunar ejecta could damage satellites and degrade constellations used for communications, navigation and weather.

• Astronaut risk: Increased micrometeoroid flux could endanger crews aboard the International Space Station or future lunar missions.

• Longer-term debris: Some fragments might remain in problematic orbits for years, complicating space operations.

Preprint studies estimate an energetic lunar impact could release on the order of 10⁸ kilograms of material; a fraction of that mass could reach near-Earth space.

Defense options under consideration

Experts outline two broad approaches: early, gentle deflection and late disruption. Each carries tradeoffs.

Deflection (preferred if there’s time)

Deflection missions — using kinetic impactors, gravity tractors or dedicated tugcraft — aim to nudge an object onto a safe trajectory. They require accurate knowledge of the asteroid’s mass, density and spin, and they are most effective when launched years before the potential impact.

Nuclear disruption (a last-resort tool)

When time is short or the object’s properties are poorly known, researchers consider nuclear devices to fragment or alter the asteroid’s trajectory. Recent modeling suggests paired nuclear charges of roughly 100 kilotons each, standoff or subsurface, could sufficiently disrupt 2024 YR4 if timed between about 2029 and 2031. But nuclear options raise complex technical, legal and political issues.

Challenges: uncertainty, timing and geopolitics

Key obstacles to any intervention include limited knowledge of the asteroid’s internal structure and mass, narrow launch windows, and the need for international consensus on using nuclear explosives in space. A reconnaissance mission between 2028 and 2030 would improve models and help select an optimal mitigation strategy.

Moreover, weaponizing space — even for planetary defense — involves treaty questions and requires diplomatic coordination among spacefaring nations. Funding and program management across multiple agencies would also have to be resolved quickly.

What scientists and agencies are doing now

Teams are refining tracking with ground telescopes and space observatories; the James Webb Space Telescope and radar assets have been tasked for characterization where possible. Researchers are publishing scenario analyses and mission designs so policymakers have options if 2024 YR4’s risk profile changes.

NASA and international partners emphasize that, at present, Earth is not threatened in 2032 — but the Moon-impact possibility merits contingency planning to protect critical space infrastructure.

Conclusion

The case of asteroid 2024 YR4 shows planetary defense moving out of the theoretical and into urgent operational planning. While an Earth impact is now unlikely, a possible lunar collision could shower near-Earth space with hazardous debris. Scientists are therefore evaluating everything from precise deflection missions to — as a last resort — nuclear disruption. Any chosen path will require accurate reconnaissance, careful timing, international coordination and clear legal mandates. The coming years will determine whether humanity can mount a timely, coordinated defense against this celestial threat.