NASA has approved the next stage of development for PRIMA (PRobe far-Infrared Mission for Astrophysics), a far-infrared space telescope designed to probe the history and evolution of the universe. As the first mission in NASA’s new Probe Explorers class, PRIMA is moving into Phase B, a development stage that emphasizes preliminary design, systems engineering and technology refinement to ensure the mission can meet its scientific and technical objectives.
The agency is targeting a 2033 launch and plans a five-year nominal operational life for the observatory. Before the mission moves forward to final approval, it will undergo a formal confirmation review that examines both technical maturity and cost estimates. If the mission receives full confirmation, its project cost will be capped at $1.2 billion, not including launch services and other external expenses.
“The PRIMA mission is humanity’s next window into the deep universe. 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,” said Nicky Fox, Associate Administrator for the Science Mission Directorate at NASA.
PRIMA will carry a 5.9-foot (approximately 1.8-meter) telescope optimized for deep surveys in the far-infrared portion of the spectrum. Observations at these wavelengths are critical for studying cool, dust-enshrouded regions where stars and planets form, and for tracing the history of dust and gas across cosmic time. In this role, PRIMA will complement existing facilities by filling observational gaps between the James Webb Space Telescope and current radio observatories.
Key Scientific Goals
The mission is designed to address several enduring astrophysical questions. Among its goals are improving our understanding of how exoplanets form within dusty disks around young stars, studying the co-evolution of galaxies and their central supermassive black holes, and tracking the production and distribution of cosmic dust over billions of years. By surveying large swaths of the sky in the far-infrared, PRIMA aims to reveal populations of objects and phases of evolution that are difficult or impossible to study at shorter wavelengths.
Mission Management and Collaboration
PRIMA is managed by NASA’s Jet Propulsion Laboratory. The mission includes substantial international collaboration, bringing together expertise and contributions from partner institutions and space agencies across Europe, Asia, and North America. These partnerships help broaden the scientific return and share technical responsibilities, while supporting instrument development, data analysis, and mission operations planning.
Origins and Program Context
The Probe Explorers concept was recommended by the National Academies’ 2020 Decadal Survey, which called for a cost-capable class of missions to address high-priority science goals more rapidly and affordably than flagship missions. PRIMA, as the inaugural Probe-class mission, serves as a testbed for executing transformative science within a constrained budget and schedule framework.
Moving into Phase B allows the PRIMA team to refine the spacecraft design, mature critical technologies, finalize instrument requirements, and better characterize the project’s cost, schedule and risk profile. These development activities will inform the confirmation review and help determine whether the mission can proceed to full implementation.
Looking Ahead
As PRIMA advances through preliminary design and technology development, the project will continue to engage the scientific community to refine its observing program and maximize scientific impact. If confirmed and launched as planned, PRIMA promises to expand our view of the cold, dusty universe and to provide new insights into the processes that shaped planets, stars and galaxies over cosmic history.