NASA’s CLARREO Pathfinder (Calibration Absolute Radiance and Refractivity Observatory Pathfinder) undergoes prelaunch processing while secured on a test stand inside the Space Systems Processing Facility at the agency’s Kennedy Space Center in Florida on Thursday, Feb. 26, 2026. CLARREO Pathfinder will launch to the International Space Station aboard SpaceX's 34th commercial resupply services mission for NASA, where it will demonstrate an ability to take highly accurate measurements of sunlight reflected by Earth and the Moon.