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NASA has selected the PRobe far-Infrared Mission for Astrophysics (PRIMA) as the first mission in its new Probe Explorers class—but the decision advances the project to Phase B, not to flight operations or an unconditional launch commitment. NASA’s current plan targets launch in 2033 for a five-year mission. PRIMA is designed to survey far-infrared light, complementing observatories such as JWST and radio telescopes to study the cold, dusty processes behind planets, stars, galaxies, and black holes.
What NASA selected—and what Phase B means
NASA announced on September 23, 2026, that PRIMA will advance to Phase B. In NASA’s project process, Phase B is for advancing preliminary design and technology development. The mission must still pass a confirmation review assessing technical, programmatic, and cost performance before it can enter Phase C implementation. The selection is therefore a significant development milestone, not final approval to build and launch the mission.
NASA’s current target is a 2033 launch, followed by a planned five-year mission. Both are plans, not completed or guaranteed events. If the project is confirmed, NASA says its 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 announcement, updated September 24, 2026, provides the current status and schedule.
Why PRIMA is the first Probe Explorer
Probe Explorers are a new class within NASA’s Explorers Program. The 2020 Decadal Survey recommended establishing the class, and NASA described it in 2024 as a mission tier intended to fill a gap between flagship missions and smaller-scale missions. PRIMA is the first mission selected for this class—not one of more than 100 Probe Explorer missions. NASA says the Explorers Program has supported more than 100 missions since Explorer 1 launched in 1958. NASA’s Explorers Program background explains the program context.
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What far-infrared observations can reveal
PRIMA is designed to conduct deep, sensitive surveys in far-infrared wavelengths. The band complements the near- and mid-infrared observations of JWST and the capabilities of radio telescopes, extending the wavelength coverage of the observatory fleet rather than replacing another observatory. NASA describes PRIMA as a way to bridge existing infrared observatories and radio telescopes. NASA’s mission announcement outlines that role.
Planets and their origins
PRIMA’s science questions include how planets beyond our solar system form and what planetary atmospheres can tell us. Far-infrared surveys are intended to help investigate the cold material and environments associated with planet formation.
Galaxies and black holes
The mission is designed to study how galaxies and their central black holes grew and evolved across cosmic history. Its observations would contribute a far-infrared view to a broader set of measurements, rather than provide a standalone account of cosmic evolution.
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Dust and the elements
NASA also identifies the accumulation of dust and heavy elements over cosmic time as a central question. PRIMA’s target science includes interstellar dust and metals, helping researchers examine material involved in the formation and evolution of stars and galaxies. NASA’s description also connects the mission’s science to how water on Earth came to be.
Planned telescope and instruments
Current concept materials describe a 1.8-meter (5.9-foot) telescope in a cryogenically cooled 4.5 K observatory. The two planned instruments are FIRESS, a wideband spectrometer, and PRIMAger, an imager and polarimeter. These are evolving design specifications, not final as-built values. The PRIMA project site and a 2024 NASA technical concept paper provide the instrument details.
| Instrument or capability | Concept coverage | What it does |
|---|---|---|
| FIRESS | 24–235 micrometers | Wideband spectroscopy |
| PRIMAger hyperspectral mode | 25–84 micrometers | Imaging with spectral information |
| PRIMAger polarimetry | Four bands from 90–235 micrometers | Measures polarization in selected bands |
The values above describe the current concept, not a final instrument configuration. An earlier NASA concept poster used different design values, including a 2.0-meter aperture, so those figures should not be mixed with the later 1.8-meter concept. NASA’s 2023 concept poster reflects that earlier design stage.
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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. The September 2026 announcement also identifies contributions from France’s CNES, Italy’s ASI, Germany’s DLR, Canada’s CSA, KASI/KASA, Japan’s JAXA, and the UK Space Agency. NASA’s updated announcement lists the participating organizations.
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PRIMA has not yet begun flight operations or produced mission observations; it is advancing through design and technology development. NASA has not announced a specific predicted number of discoveries. The mission’s scientific aims and instrument coverage describe what it is being designed to investigate, not results it has already achieved.
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