On Feb. 26, 2025, NASA launched Lunar Trailblazer from Kennedy Space Center with a $72 million mission to map water on the moon. A day after liftoff, mission controllers lost contact with the probe and never regained it.
A NASA-convened review panel, whose report was provided to NPR under a Freedom of Information Act request, says the primary cause was a software error that commanded the spacecraft’s solar panels to point 180 degrees away from the sun. That mistake, combined with “many erroneous on-board fault management actions,” led the panel to conclude those failures together caused the loss of Lunar Trailblazer.
Lockheed Martin built the low-cost spacecraft. The review found the company did not adequately test the solar-panel-pointing software before launch. Mission teams might have been able to correct the mispointing, the report says, but other software problems hampered and ultimately prevented recovery efforts.
NASA and Lockheed Martin declined to provide spokespeople for the story but issued separate statements saying they had learned from the failure. NASA said the loss was disappointing but offers “powerful lessons that can be applied to future lower-cost missions.” Lockheed Martin noted that lower-cost programs carry higher inherent risk and said teams are enhancing fault management architecture, flight software implementation and pre-launch testing while “balancing risk acceptance” for faster, less-funded programs.
Experts and mission leaders described the failure as the sort that usually stems from multiple, cascading issues rather than a single fault. Timothy Cook, an associate professor at the University of Massachusetts Lowell who managed a failed 1999 mission with a similar solar-panel pointing problem, said complex systems often suffer a chain of problems that compound into total loss.
Scott Hubbard, a longtime NASA veteran now at Stanford, said NASA knowingly accepts greater risk with class D — lower-cost — missions. But he emphasized that acceptable risk should be understood and mitigated: class D should not mean the entire mission is likely to fail. “Cheap failure is no good for anybody,” he said.
Bethany Ehlmann, the principal investigator for Lunar Trailblazer, called the loss gutting for a team that invested years preparing the mission. She expressed gratitude for the community’s efforts during the recovery attempt and said the review underscores the need to align institutional objectives, contracting and technical approaches tightly around mission success. She welcomed NASA’s decision to share the report so others can learn from the mistakes.
The report also resonated with investigators of other class D projects. Robert Lillis, principal investigator for Escapade — a pair of class D spacecraft headed to Mars to study solar-wind interactions — said Lunar Trailblazer prompted extra scrutiny of his mission before its November launch. After Escapade lifted off, the team initially heard nothing and feared a Trailblazer repeat. The silence ended when managers discovered the ground antennas had been pointed slightly wrong; once corrected, contact was made about six hours after launch, prompting intense relief. Escapade will not reach Mars until September next year, so definitive lessons remain to be tested in flight.
The review’s findings point to the technical and programmatic trade-offs in lower-cost missions: they can deliver valuable science more affordably, but when testing, fault management, and software implementation are constrained, the chance of unrecoverable errors rises. The panel’s recommendations and the agencies’ commitments to improve pre-launch testing, fault management, and software practices aim to reduce those risks for future missions.