Retroreflector for ESA Satnav on Lunar Pathfinder Delivered

NASA has delivered a retroreflector array to ESA that will allow the Lunar Pathfinder mission to be pinpointed by laser ranging stations back on Earth as it orbits the Moon. Such centimeter-level laser measurements will serve as an independent check on the spacecraft as it fixes its position using Galleo and GPS signals from an unprecedented 400,000 km …