LuGRE, part of the Firefly Blue Ghost Mission 1, successfully tracks Earth orbital GNSS satellites on the Moon.LuGRE is a weak-signal GNSS receiver designed by NASA and the Italian Space Agency.This achievement demonstrates the possibility of using Earth's GNSS satellites for navigation and positioning in future lunar missions.LuGRE is part of NASA's Commercial Lunar Payload Services program, delivering ten payloads to study the lunar environment and relevant technologies.