NASA commits $1.2 billion to a telescope that won’t launch until 2033

NASA has committed $1.2 billion to build PRIMA, a far-infrared space telescope that will not launch until 2033. The agency selected the mission on Sept. 24, 2026, making it the first spacecraft chosen for an entirely new class of astrophysics missions. Managed by NASA’s Jet Propulsion Laboratory, PRIMA is designed for five years of observing wavelengths no working NASA telescope currently covers. The commitment locks in a price years before any of that science arrives.

Nicky Fox, NASA’s associate administrator for the Science Mission Directorate, said the PRIMA mission is “humanity’s next window into the deep universe.” She added that it will “unveil the obscure across cosmic time to better understand the formation of planets, stars, black holes, and even how water on Earth came to be.”

A 5.9-Foot Mirror Built for Far-Infrared Light

The spacecraft carries a 5.9-foot aperture tuned to far-infrared light, the faint heat signature given off by cold dust, forming planetary systems and galaxies too obscured for optical or near-infrared telescopes to resolve clearly. NASA capped the mission’s cost at $1.2 billion, excluding launch and other non-project costs, and PRIMA will spend a planned five-year primary mission surveying exoplanet origins, the evolution of galaxies and black holes across cosmic history, and how dust and heavy elements accumulate over billions of years.

NASA’s Jet Propulsion Laboratory in Southern California will manage PRIMA day to day, working alongside the agency’s Goddard Space Flight Center and Marshall Space Flight Center on instrument development and mission operations. Shawn Domagal-Goldman, director of NASA’s Astrophysics Division, said a single mission “can’t probe all the universe’s mysteries,” and described PRIMA as extending the reach of NASA’s infrared survey fleet into a range none of the agency’s current telescopes cover. He tied the selection to the cadence NASA has kept with the Webb and Roman space telescopes, framing PRIMA as the start of a pipeline meant to keep premiere-class missions launching in both halves of each decade.

NASA’s Explorer Program Gains a Billion-Dollar Tier

PRIMA is the first mission chosen for NASA’s new Probe Explorers class, a tier the National Academies’ 2020 Decadal Survey in astronomy and astrophysics recommended NASA create to fund science too large for its existing small satellites and too narrow to justify a flagship-scale telescope. NASA formally established the class on Oct. 4, 2024, and opened it to competing proposals almost immediately.

The survey that created the tier capped Probe missions at $1.5 billion and recommended NASA select one roughly every decade, using the class to keep observations running across the spectrum while a much larger flagship telescope spends years in early design. It also suggested Probe selections begin around fiscal year 2026, the same year NASA chose PRIMA.

NASA picked two finalists for that first Probe slot on Oct. 3, 2024: PRIMA, led by principal investigator Jason Glenn of NASA’s Goddard Space Flight Center, and an X-ray observatory called AXIS, led by Christopher Reynolds of the University of Maryland. Each team received $5 million and a year to refine its concept before the agency chose between them; AXIS would have studied the origins of supermassive black holes and the forces driving cosmic explosions, while PRIMA was pitched to bridge a gap between existing infrared and radio telescopes. Fox has described the competition as the largest her Astrophysics division has ever run, and the Sept. 24 selection ended two years of competing proposals in favor of the far-infrared design. NASA’s own cost cap for the new class also moved in that time, from $1 billion per mission at the 2024 announcement to the $1.2 billion ceiling PRIMA carries today.

That price tag dwarfs NASA’s older Explorer tiers. Medium-class Explorer missions are capped around $180 million to $200 million, and Small Explorers top out near $120 million, both a fraction of PRIMA’s $1.2 billion ceiling. NASA describes the broader Explorers Program, which traces back to Explorer 1 in 1958, as the longest-running series of spacecraft in the agency’s history; the Probe tier is the newest and by far the most expensive rung on that ladder.

Seven Years Between Selection and Launch

PRIMA’s timeline has already slipped once. When NASA opened the Probe competition in 2024, it targeted a 2032 launch for whichever concept won. The Sept. 24 selection pushed that date to 2033, with the spacecraft expected to operate for five years once it reaches orbit. NASA has not detailed what drove the one-year change.

The mission also carries a roster of international partners. France’s CNES, Italy’s ASI, Germany’s DLR, the Canadian Space Agency, South Korea’s KASI, Japan’s JAXA and the UK Space Agency are each contributing hardware, instruments or funding to the far-infrared observatory, splitting costs the way NASA has increasingly done on large astrophysics missions since Webb.

Domagal-Goldman has framed PRIMA as the opening act of a pipeline meant to keep NASA launching premiere-class missions roughly every few years, following Webb and the still-unlaunched Roman Space Telescope. Whether that pipeline continues depends partly on AXIS, the X-ray probe that lost the first Probe competition and remains the leading candidate for whichever Probe-class mission NASA selects next.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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