Giant Telescope Pinpoints Artemis 2’s Moon Loop in Unprecedented Detail

NSF's Green Bank Telescope tracked NASA's Artemis 2 Orion capsule around the Moon for five days from more than 213,000 miles away, delivering distance and Doppler measurements that matched NASA projections to about 0.2 millimeters per second and producing a pixelated image of the spacecraft with a scientist noting “there are four people in those pixels.” The observations illustrate how a giant radio telescope can assist future space missions and radar-related efforts, highlighting the Green Bank Telescope’s role as the largest moving structure on land.