15,000 Asteroids and No Financial Plan: The Planetary Defense Funding Gap

Kelly Fast has a number that should keep policymakers up at night. Speaking at the American Association for the Advancement of Science meeting in February 2026, NASA's acting Planetary Defense Officer reported that of the estimated 25,000 near-Earth objects 140 meters or larger, roughly 15,000 remain unaccounted for.

Fifteen thousand.

Each one, if it struck Earth, could flatten a metropolitan area. And we don't know where they are.

But here's what makes the financial question urgent: the detection problem is being addressed. Congress knows about it, NASA is working on it, and there's a spacecraft under construction specifically designed to find those missing rocks. The problem nobody has solved — the problem nobody is seriously working on — is what happens financially when we find one with our name on it.

The Detection Story Is Actually Good

Let's give credit where it's earned. A decade ago, NASA's planetary defense budget was around $50 million. For FY2026, Congress appropriated $341 million, with $300 million of that going to the NEO Surveyor mission, an infrared space telescope scheduled for launch in September 2027.

That's a nearly sevenfold budget increase in ten years. It's one of the few areas of federal science funding where bipartisan support has been consistent and growing. And NEO Surveyor is purpose-built for exactly the gap Fast described: an infrared telescope positioned at the Sun-Earth L1 Lagrange point, designed to detect dark asteroids that ground-based optical surveys miss. The mission targets detection of 65% of remaining 140-meter-plus NEOs within five years of operation, and 90% within a decade.

We also know deflection works. NASA's Double Asteroid Redirection Test (DART) — a $330 million mission that slammed a 570-kilogram spacecraft into the moonlet Dimorphos in September 2022 — didn't just nudge the asteroid. It obliterated the minimum success benchmark. The mission was designed to change Dimorphos's orbital period by at least 73 seconds. The actual change was 32 minutes. The momentum transfer efficiency, measured by the beta factor, came in at 3.6 — meaning the ejected debris from the impact contributed nearly three times as much momentum as the impactor itself.

DART proved that kinetic deflection works, and works far better than conservative models predicted. That's the good news.

The Gap That Nobody Is Filling

Here's the bad news. DART took approximately four years from mission approval to impact. It targeted an asteroid that posed zero threat to Earth, on a timeline chosen entirely for engineering convenience. The mission had no deadline imposed by physics.

A real deflection mission wouldn't have that luxury.

The deflection window for a kinetic impactor depends on the warning time, the object's size, and its orbital geometry — but broadly, the further out you act, the less energy you need. A nudge applied ten years before impact requires orders of magnitude less momentum transfer than one applied two years out. And if warning time drops below roughly 12 to 18 months for a 140-meter object, kinetic impact may not be sufficient at all, pushing the response toward nuclear standoff detonation — a technique that works in simulations but has never been tested.

So the question becomes: if NEO Surveyor detects a 200-meter asteroid on a collision course with Earth, and we have, say, five years of warning, what happens next?

Who funds the deflection mission? Through what mechanism? On what timeline?

Right now the answer is: nobody, through nothing, with no plan.

There is no pre-funded rapid-response deflection capability. No emergency procurement authority analogous to FEMA's disaster response funds. No international cost-sharing agreement. No standing production line for deflection spacecraft. The DART spacecraft was custom-built by Johns Hopkins APL over several years. Replicating that on an emergency timeline, with the entire planet waiting, would require financial and procurement mechanisms that do not currently exist.

The Planetary Society's Casey Dreier calls this the gap between detection and response capability — and it gets worse when you examine the details.

The Probability Trap

One reason the financial architecture hasn't been built is that the per-year probability of a large impact is genuinely low. For a 140-meter object, the estimated frequency is roughly once per 20,000 years. For a 1-kilometer object — the size that would cause global climatic effects — it's closer to once per 500,000 years.

These numbers make it easy to defer. Twenty thousand years is a long time. And there are more immediate threats competing for budget.

But probability math can be deceptive when the consequences are extreme. The expected annual loss from asteroid impact — probability multiplied by consequence — is estimated by various groups at somewhere between $100 million and $1 billion per year, depending on assumptions about impact effects and economic modeling. That's comparable to the expected annual loss from some categories of natural disaster that we fund extensive preparedness programs for.

More importantly, the expected annual cost of maintaining a deflection-ready capability is almost certainly less than $100 million — the recurring cost of keeping a mission design current, maintaining a production-ready spacecraft bus, and holding contingency procurement contracts. If you could prevent even one civilization-scale catastrophe over the next ten thousand years, the cost-benefit arithmetic is overwhelming.

We buy fire insurance on houses that have a less than 1% chance of burning down in a given year. We spend billions on missile defense systems for threats that may never materialize. But for an asteroid deflection capability — where we've already proven the technology works — we've decided that detection is enough and the financial question can wait.

What Other Countries Are Doing (And Not Doing)

This isn't just an American gap. The European Space Agency's Hera mission, which arrived at Dimorphos in late 2024 to conduct detailed post-impact surveys, represents Europe's most significant planetary defense investment. China has discussed a combined kinetic impactor and observation mission targeting asteroid 2019 VL5, potentially launching around 2030. Japan's Hayabusa program, while primarily scientific, has demonstrated relevant rendezvous and impact capabilities.

But no nation has established a funded, standing deflection capability. No international treaty or agreement allocates costs for a deflection mission. The UN Committee on the Peaceful Uses of Outer Space (COPUOS) has a Space Mission Planning Advisory Group (SMPAG) that develops reference mission concepts, but SMPAG has no budget, no procurement authority, and no mechanism to compel member states to contribute funding.

The international coordination gap is arguably worse than the domestic one. If a 300-meter asteroid is detected on a trajectory that would impact Southeast Asia, who decides on the deflection approach? Who pays? What legal authority governs a nuclear standoff detonation in deep space? The Outer Space Treaty prohibits nuclear weapons in orbit, but does a one-time nuclear deflection device constitute a "weapon"? These questions have been debated in academic papers. They have not been resolved in any binding agreement.

What a Financial Plan Would Look Like

The ingredients for a planetary defense financial architecture are not complicated. They're just unfunded.

First, a standing emergency fund — call it $500 million, replenished annually at a lower level — specifically earmarked for rapid-response mission procurement. This fund would be triggered by a confirmed threat assessment from NASA's Center for Near Earth Object Studies (CNEOS) exceeding a defined Torino Scale threshold.

Second, pre-negotiated contracts with spacecraft manufacturers for deflection-mission components. Not full spacecraft sitting in warehouses — that's wasteful — but standing agreements that allow the procurement timeline to be compressed from four years to eighteen months. The model here is the U.S. Strategic National Stockpile for medical countermeasures, which maintains contracts for rapid production of vaccines and therapeutics.

Third, an international cost-sharing framework, probably administered through COPUOS or a dedicated treaty body, that allocates deflection mission costs among spacefaring nations based on GDP and launch capability. This is politically difficult. It is also necessary.

Fourth, a parametric insurance mechanism — similar to catastrophe bonds — that allows private capital to participate in planetary defense financing. An asteroid impact bond, triggered by confirmed detection of a threatening object above a specified size and probability threshold, could raise billions in private capital on short timescales. The parametric structure is clean: the trigger is measurable (CNEOS probability assessment), the payout conditions are unambiguous, and the underlying data is public.

The total recurring cost of this architecture? Probably $200-400 million per year across all participating nations. For comparison, global military spending in 2025 exceeded $2.4 trillion.

The Clock We Can't See

Here is the uncomfortable reality. Somewhere out there, almost certainly, one of those 15,000 undetected asteroids has our address on it. Not this century, probably. Not this millennium, perhaps. But the question isn't whether a threatening NEO will be detected — it's whether, on the day it is, we'll have anything besides a press conference ready.

NEO Surveyor will start finding them in 2028. That gives us roughly two years to build the financial architecture that turns detection into action. Two years to go from smoke alarm to fire department.

The telescope is funded. The rocket is booked. The detection pipeline is ready.

The checkbook isn't open.