NASA has selected the PRobe far-Infrared Mission for Astrophysics (PRIMA) as the first mission in its new Probe Explorers class, advancing it to Phase B. That is a significant design milestone—not final approval to build or launch: PRIMA must still pass a confirmation review before Phase C implementation can begin. NASA’s current plan targets launch in 2033 and a five-year mission.
What NASA’s selection means
NASA announced the selection on September 23, 2026. Phase B is for advancing preliminary design and technology development. Before the project can move into Phase C implementation, it must pass a confirmation review that assesses technical, programmatic, and cost performance. The selection therefore advances PRIMA through development, but does not guarantee that it will launch.
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NASA’s current plan is to launch PRIMA in 2033 and operate it for five years. Those are targets, not completed events or guarantees. If confirmed, NASA says the project cost is capped at $1.2 billion, excluding launch and other non-project costs; that figure is not the total mission price. NASA’s September 23 selection announcement, updated September 24, 2026, gives the current status and plan.
Why NASA created the Probe Explorers class
PRIMA is the first selection in the Probe Explorers class, part of NASA’s Explorers Program. The 2020 Decadal Survey recommended establishing this class. NASA described it in 2024 as a mission tier between large flagship missions and smaller-scale missions, intended to fill a gap in the agency’s portfolio. The Explorers Program as a whole has included more than 100 missions since Explorer 1 launched in 1958; that historical total does not mean there have been more than 100 Probe Explorer missions.
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For background on the class and its place in the program, see NASA’s 2024 overview of Probe Explorers and the Explorers Program.
What PRIMA will study in far-infrared light
PRIMA is designed to make deep, sensitive surveys in far-infrared wavelengths. NASA presents it as a way to extend the capabilities of its observatory fleet, complementing telescopes such as the James Webb Space Telescope (JWST) and radio observatories rather than replacing them. Different wavelength ranges reveal different aspects of the universe; PRIMA’s intended contribution is to observe far-infrared signals that help trace cold, dusty environments and processes.
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NASA identifies several linked science questions:
- How planets form: Far-infrared observations can help researchers investigate the cold material and dust associated with planet formation, including the origins of planets beyond our solar system.
- How galaxies and black holes evolve: PRIMA is intended to survey galaxies across cosmic history and examine how galaxies and the black holes at their centers grew and changed.
- How cosmic dust and elements accumulate: The mission will study how dust and heavy elements built up over time, connecting the life cycles of stars to the material from which later generations of stars and planets form.
NASA also frames the mission’s broader scientific reach around the formation of planets, stars, and black holes, and questions such as how water on Earth came to be. These are research aims, not discoveries PRIMA has already made. NASA Astrophysics describes the mission’s planned survey role and scientific goals in its PRIMA mission overview.
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The planned telescope and instruments
Current concept materials describe a telescope with a 1.8-meter (5.9-foot) aperture and a cryogenically cooled observatory operating at 4.5 K. The design includes two instruments. These are planning specifications, not final as-built values, and may change as the mission moves through development.
| Instrument | Planned capability | Design coverage |
|---|---|---|
| FIRESS | Wideband spectrometer | 24–235 micrometers |
| PRIMAger | Imager and polarimeter | Hyperspectral coverage: 25–84 micrometers; polarimetry in four bands from 90–235 micrometers |
Spectroscopy separates light into its component wavelengths, helping characterize the material and conditions being observed. Imaging maps sources across the sky, while polarimetry measures the orientation of light—useful for studying properties such as the structure of dusty environments. The IPAC/Caltech PRIMA project page and a 2024 NASA technical concept paper describe the evolving observatory and instrument design.
Who is developing the mission
NASA’s Jet Propulsion Laboratory will manage PRIMA, with roles for Goddard Space Flight Center and Marshall Space Flight Center. NASA’s September 2026 announcement also lists international contributions from France’s CNES, Italy’s ASI, Germany’s DLR, Canada’s CSA, KASI/KASA in South Korea, Japan’s JAXA, and the UK Space Agency.
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What is—and is not—known yet
PRIMA remains in development, so it has not begun observing and there are no mission results or published discovery totals to report. The current telescope and instrument figures come from concept materials; they describe the design NASA is advancing, not guaranteed final specifications. The key near-term milestone is the confirmation review that must precede Phase C.
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