NASA Advances PRIMA Far-Infrared Telescope Mission

The PRobe far-Infrared Mission for Astrophysics moves into Phase B, with possible Japanese participation under domestic review.

Updated on Nov. 7, 2026 in Space

Bold flat-color editorial illustration of nested gold telescope tubes and a segmented circular mirror in cold blue light against deep navy space. — NASA selected the PRIMA far-infrared telescope to enter Phase B design, targeting a 2033 launch to observe dust and gas that Earth's atmosphere blocks. AI Illustration. Upload story photo >

NASA selected the PRobe far-Infrared Mission for Astrophysics (PRIMA) to enter Phase B, advancing it into preliminary design and technology development. The mission is the first in NASA's Probe Explorers class and is targeted for launch in 2033.

Why it matters

PRIMA would observe far-infrared wavelengths that Earth's atmosphere largely blocks, a range that has gone roughly two decades without dedicated science since the Herschel mission ended. The mission would help researchers study dust and the gas and heavy elements that shape galaxies.

The telescope is a 1.8-meter instrument cooled to 4.5 kelvins, about -268 degrees Celsius, to detect faint far-infrared light. Participation by Japanese researchers and the mission's final scope remain pending domestic reviews and a confirmation review.

The players

NASA

The National Aeronautics and Space Administration is the U.S. federal agency responsible for civilian space exploration and astronomy research.

NASA Jet Propulsion Laboratory

JPL is a NASA research center in Southern California that designs and manages robotic spacecraft and planetary missions.

JAXA

The Japan Aerospace Exploration Agency is Japan's national space agency, which oversees its civilian space programs and research.

The details

PRIMA would carry an imager to map dust emission and measure its polarization, along with a spectrometer to trace gas and heavy elements. The NASA Jet Propulsion Laboratory in Southern California will manage the mission.

June 2023: Organized PRIMA-related activities by researchers in Japan began.
December 2024: The Japanese effort became a working group at ISAS, part of JAXA.
2033: NASA targets the PRIMA launch for its planned five-year mission.

The Big Picture

PRIMA would revive dedicated far-infrared astronomy that has been largely absent since the Herschel Space Observatory ended its science operations about two decades ago. Because Earth's atmosphere blocks these wavelengths, the mission would open a window on dust and heavy elements that ground-based telescopes cannot observe.

If launched, PRIMA would give astronomers a new instrument for studying dust and gas in galaxies that other telescopes cannot easily observe. The science it produces could inform future research on how stars and galaxies form and evolve.

The takeaway

Far-infrared astronomy has been largely dormant since Herschel, and PRIMA's progress signals renewed interest in observing wavelengths hidden from Earth's surface. Readers following space science can watch for the confirmation review as the key near-term milestone.

What happens next

PRIMA must pass a confirmation review before it can enter Phase C implementation, and domestic reviews in Japan will continue as the mission proceeds.