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"It keeps me up at night. We've only found about 40 percent of the near-Earth asteroids larger than 140 meters. We don't know where the rest are."

— KELLY FAST, NASA ACTING PLANETARY DEFENSE OFFICER, FEBRUARY 2026

THE NUMBERS THAT MATTER

15,000 Asteroids. Untracked. Out There Right Now.

In February of this year, NASA's acting planetary defense officer Kelly Fast stood before the American Association for the Advancement of Science in Phoenix and delivered what should have been a front-page, alarm-the-nation revelation. Scientists estimate there are roughly 25,000 near-Earth asteroids larger than 140 meters in diameter — large enough to devastate a major city on impact. NASA has found and catalogued approximately 40% of them. The other 15,000 are out there right now, untracked, orbiting in darkness, their trajectories unknown.

Asteroid 2026 JH2 is smaller than that threshold — estimated between 50 and 115 feet wide, closer in scale to the Chelyabinsk meteor that exploded over Russia in 2013, blowing out windows and injuring more than 1,000 people. But it is a perfect, uncomfortable illustration of the detection problem. We didn't see it coming until it was practically knocking on the door.

Nancy Chabot, the planetary scientist at Johns Hopkins University who led coordination for NASA's historic DART mission — the spacecraft that successfully redirected an asteroid's orbit in 2022 — put the readiness gap in language that cannot be softened: "We don't have a DART just lying around ready to go if there was a threat we needed to use it for."

No replacement deflection spacecraft has been built. No ready-to-launch planetary defense interceptor sits in any inventory. The test worked beautifully. The operational capability it demonstrated is gone.

SPACE SECURITY

America's Planetary Defense Is at a Crossroads

The United States is not without a strategy. NASA's Planetary Defense Coordination Office, established in 2016, coordinates detection, tracking, and mitigation research. The Department of Energy's National Nuclear Security Administration — home of Sandia, Los Alamos, and Lawrence Livermore National Laboratories — contributes nuclear-weapons expertise to model what a worst-case deflection mission might require. FEMA has emergency response protocols on the books. The architecture, on paper, exists.

But architecture and readiness are not the same thing. A NASA Inspector General report from 2025 found funding constraints had already pushed the launch of NEO Surveyor — a space-based infrared telescope specifically designed to find the dark, hard-to-detect asteroids that ground observatories miss — from 2026 to a 2027–2028 window, while its cost estimate ballooned from $1 billion to $1.6 billion. The White House earlier this year proposed a sweeping 25% cut to NASA's overall budget. Congress rejected the bulk of those cuts, but the threat underscored how fragile the funding base for planetary defense truly is.

Former NASA Administrator Jim Bridenstine, speaking at the Space Foundation's 41st Space Symposium in April, made the case for a commercial model: "You want the government to be one customer of many customers for a very robust commercial marketplace."

Edward Lu, former NASA astronaut and head of the Asteroid Institute, was equally direct about the current posture: "NASA's planetary defense budget is less than one percent of the total space agency. That's not enough to ever do anything."

The gap between what we know and what we can do is not theoretical. It is measured in days. Eight of them, in fact.