NASA officials confirmed on Oct. 27, 2026, that the UltraViolet EXplorer space telescope passed Key Decision Point C, a technical and programmatic review.
The confirmation clears a formal review for UVEX. NASA described Key Decision Point C as a technical and programmatic assessment completed by UVEX. Passing it leads to firm agency commitments on timing and cost.
Passing KDP-C commits NASA to launching UVEX by January 2031. The review sets the mission‘s total lifecycle cost at $590 million. NASA ties the launch date and cost directly to successful completion of KDP-C.
NASA selected UVEX for development in 2024 as a Medium-Class Explorer mission. The selection preceded the KDP-C review. It placed UVEX within NASA’s explorer program line.
UVEX will conduct a sensitive survey of ultraviolet light across the entire sky. The all-sky survey is intended to generate new understanding of stellar and galactic evolution. NASA linked the science objective to the mission’s sensitive all-sky ultraviolet observations.
NASA frames the ultraviolet contribution as part of a broader effort to chart the cosmos across wavelengths of light. UVEX will work with other wide-survey missions such as Nancy Grace Roman to map the universe across different wavelengths.
The observatory can rapidly point toward ultraviolet sources to capture explosions following gravitational-wave bursts from merging neutron stars (collapsed cores of massive stars). This capability allows UVEX to observe short-lived cosmic transients connected to neutron-star mergers.
Fiona Harrison, based at Caltech in Pasadena, California, serves as the mission’s principal investigator. Caltech hosts the mission’s science leadership under Harrison. The mission’s institutions include University of California at Berkeley, Northrop Grumman, NASA’s Jet Propulsion Laboratory, and Space Dynamics Laboratory. These institutions and companies join Caltech as UVEX participants.
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