Science & Environment Retired NASA astronaut Leland Melvin on the goal of Artemis II and its significance NPR | By Leila Fadel Published April 1, 2026 at 1:40 AM PDT Twitter LinkedIn Email 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