NASA’s Arcstone Instrument Successfully Completes Primary MissionNASA’s Arcstone instrument, designed to improve the accuracy of lunar calibration, successfully completed its technology demonstration, and now begins extended operations. The mission, led by NASA’s Langley Research Center in Hampton, Virginia, uses a specially designed spectrometer system and is the first on-orbit instrument solely dedicated to improving the accuracy of lunar calibration. An artist’s rendering of NASA’s Arcstone instrument on-orbit gathering measurements of lunar reflectance by sequentially observing the Moon and Sun. The Arcstone technology demonstration is a low-cost mission funded by NASA’s Earth Science Technology Office’s In-space Validation of Earth Science Technologies Program. For more information on NASA’s Arcstone mission, visit:https://science.nasa.gov/mission/arcstone/