NASA has committed a dedicated space telescope to find the most dangerous asteroids that have so far escaped detection.
With a 2027 launch now secured, the mission marks a decisive step toward closing the gap in humanity’s ability to spot large, city-threatening rocks before they approach Earth.
Origin of NEO Surveyor
Years of planning around NEO Surveyor have focused on one stubborn problem: large, dark asteroids that current searches struggle to see until they are already relatively close.
Working from the University of California, Los Angeles (UCLA), Dr. Amy Mainzer pressed NASA to build a mission designed specifically to reveal those hidden objects and document their paths.
By centering the spacecraft on heat detection rather than reflected sunlight, the team sharpened its focus on the faint bodies most likely to slip past ground surveys.
That commitment now ties the telescope’s success to its ability to uncover and track the very objects that have long remained beyond reach, setting the stakes for what the launch must deliver.
SpaceX selected for launch
NASA’s NEO Surveyor mission page sets the earliest launch for September 2027 and lists the project as active.
A 2025 Inspector General report described how NASA turned the launch plan into a set-price contract.
“NASA awarded a contract worth about $100 million to SpaceX to provide launch and other mission-related services,” stated the NASA Office of Inspector General.
Booking a rocket years ahead forces the spacecraft team to hit strict size and weight limits in hardware.
Why infrared matters
Dark asteroids reflect little light, but they still give off heat that shows up in infrared, heat-sensing light invisible to human eyes.
NEO Surveyor carries one instrument, an almost 20-inch telescope that works in two infrared wavelengths.
Those detectors let it spot both bright asteroids and darker ones that current searches often miss until too late.
Seeing heat instead of reflected sunlight could widen the catalog of possible threats long before they become headlines.
Counting risky objects
Asteroids and comets that come within 30 million miles (48 million kilometers) of Earth’s orbit are called near-Earth objects, bodies whose paths cross our neighborhood.
Over its five-year survey, the telescope aims to find two-thirds of unknown near-Earth objects, or NEOs, above 460 feet (140 meters).
Rocks above that size can devastate a region in one hit, so the threshold keeps the mission focused on serious risk.
Smaller objects still matter, but the survey focuses on the larger bodies most likely to leave lasting harm.
Turning heat into asteroid data
Spotting a new object is only the start, because risk depends on its size and its path.
By measuring how much heat a rock gives off, the telescope can estimate size more accurately than reflected light.
Those same heat data can hint at surface material and reveal how an asteroid spins, tumbles, and travels.
Better size estimates and cleaner orbits can cut false alarms and help agencies decide when NEOs need action.
Where NEO Surveyor will scan
From a spot away from Earth, NEO Surveyor can scan regions of the sky that stay hidden in daylight glare.
That view matters because some hazardous asteroids approach from the Sun’s direction, and ground telescopes cannot track them early.
A 2023 paper described repeated sweeps that make moving objects stand out against fixed background stars.
Staying cold enough to measure faint heat will limit where the telescope points at once, so coverage takes time.
Turning sightings into tracks
Each discovery begins as a handful of faint points, and software must connect them into one moving object.
By revisiting the same patch of sky, the mission can watch an asteroid move and tighten its orbit estimate.
After the telescope flags a candidate, ground observers can check that object again and keep refining its path for years.
Without steady follow-up, even a good first sighting can fade into uncertainty, leaving planners with too little confidence.
Planetary defense decisions
Since 2016, NASA has built planetary defense, organized work to find and respond to impact threats, into a standing program.
“We can’t do anything about an incoming asteroid if we don’t know it’s there,” said Dr. Amy Mainzer, a UCLA astronomer.
NEO Surveyor cannot stop an asteroid on its own, but it can buy time for decisions once NEOs come into view.
Limits and tradeoffs
Big space missions rarely stick to their first schedules, and NEO Surveyor has already faced funding-driven replans.
In a 2025 audit, NASA’s watchdog said the baseline cost rose from $1 billion to $1.6 billion, delaying readiness.
When money arrives late, teams postpone tests, renegotiate contracts, and accept tighter reserves that leave little room for surprises.
Keeping the launch date will depend on steady funding and enough ground support to turn discoveries into trusted warnings.
What happens after launch
NASA now has a booked launch and a clear plan for spotting hidden asteroids, then turning them into tracked targets.
Long-term funding and follow-up observations will decide whether those targets become routine catalog entries or the first step in response.
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