Retired NASA astronaut Leland Melvin on the goal of Artemis II and its significance NPR | By Leila Fadel Published April 1, 2026 at 4:40 AM EDT Twitter LinkedIn Email Listen • 3:31 NPR's Leila Fadel talks to retired NASA astronaut Leland Melvin about the scientific and cultural significance of the Artemis II moon mission. Copyright 2026 NPR