NASA's Lunar Trailblazer spacecraft sits in a clean room in August 2024 after undergoing environmental testing at Lockheed Martin Space in Littleton, Colorado. Now that those tests are done, the orbiter and its science instruments will go through flight system software tests that simulate key aspects of launch, maneuvers, and the science mission while in orbit around the Moon.

This photo shows Lunar Trailblazer with a solar array deployed. The large silver grate attached to the spacecraft is the radiator for the High-resolution Volatiles and Minerals Moon Mapper (HVM³) instrument. HVM³ is one of two instruments that will be used by the mission to detect and map water on the Moon's surface to determine its abundance, location, form, and how it changes over time. This data will be key to our understanding of this crucial resource on the Moon for future exploration.

The spacecraft is just 440 pounds (200 kilograms) and 11.5 feet (3.5 meters) wide with its solar panels fully deployed.

The project is led by Principal Investigator Bethany Ehlmann of Caltech and managed by NASA's Jet Propulsion Laboratory in Southern California, which is also providing systems engineering, navigation, and mission assurance. Caltech manages JPL for the agency.

Lunar Trailblazer is part of NASA's Small Innovative Missions for Planetary Exploration (SIMPLEx) program, which provides opportunities for low-cost, high-risk science missions that are responsive to requirements for flexibility. These lower-cost missions serve as an ideal platform for technical and architecture innovation, contributing to NASA's science research and technology development objectives. SIMPLEx mission investigations are managed by the Planetary Missions Program Office at NASA's Marshall Space Flight Center in Huntsville, Alabama, as part of the Discovery Program at NASA Headquarters in Washington. IPAC leads mission operations, including planning, scheduling, and sequencing all science and spacecraft activities.