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NASA’s PRIMA (PRobe far-Infrared Mission for Astrophysics) space telescope is advancing to Phase B, the stage in which engineers will refine the mission’s preliminary design and develop the technologies required for its construction. PRIMA will be the first mission in NASA’s new Probe Explorers class, established within the agency’s longstanding Explorers Program.

NASA describes PRIMA as a new window onto the deep universe. By observing far-infrared light, the mission will investigate how planets, stars, galaxies, and black holes form and evolve, while also examining the origins of cosmic dust, heavy elements, and the water that eventually contributed to Earth’s development.

Before PRIMA can enter Phase C—the implementation stage—NASA will conduct a confirmation review assessing its technical readiness, programmatic plans, and projected costs. If the mission is approved, its project cost will be capped at $1.2 billion, excluding launch and other expenses outside the project. NASA is targeting a 2033 launch and plans to operate the observatory for five years.

PRIMA will carry a 5.9-foot (1.8-meter) telescope designed to conduct deep and sensitive surveys of the universe in far-infrared wavelengths. These observations will complement the capabilities of existing infrared observatories, including the James Webb Space Telescope, while extending astronomical research toward the range between infrared and radio astronomy.

Far-infrared observations are especially valuable because much of the radiation associated with cool gas, dust, and distant star-forming regions emerges at these wavelengths. PRIMA will therefore help astronomers study the formation of planetary systems, the growth of galaxies and their central black holes, and the gradual accumulation of dust and heavy elements throughout cosmic history.

Together, these investigations may clarify why the universe has developed its present structure and composition.

The Probe Explorers mission class was recommended by the National Academies of Sciences, Engineering, and Medicine in its 2020 decadal survey, Pathways to Discovery in Astronomy and Astrophysics for the 2020s. NASA selected PRIMA after evaluating proposed missions for scientific value, consistency with the survey’s priorities, technical feasibility, cost and schedule, and their potential to develop technologies useful for future large observatories.

NASA’s Jet Propulsion Laboratory in Southern California will manage the mission. NASA’s Goddard Space Flight Center and Marshall Space Flight Center will also contribute, along with international partners from France, Italy, Germany, Canada, South Korea, Japan, and the United Kingdom.

The Explorers Program is NASA’s longest-running continuous program for relatively frequent and cost-conscious space-science missions. Since Explorer 1 launched in 1958 and discovered Earth’s radiation belts, the program has supported more than 100 missions, including Uhuru and the Cosmic Background Explorer, whose scientific achievements contributed to Nobel Prizes.

PRIMA represents a new step in that tradition, offering a powerful but more focused observatory for exploring the universe’s history and evolution.

Reference

Fisher, A. (2026, September 24). NASA Selects Far-Infrared Telescope as First in New Mission Class. NASA.

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Coram Deo — before the face of God. This blog reflects on Scripture, world events, science, music, psychology, and the human mind — always through the lens of Christian faith. All of life is lived before the face of God.