Artemis is the ancient Greek goddess of the hunt, wilderness, wild animals, moon, and childbirth, twin sister of Apollo, daughter of Zeus and Leto, with the Roman equivalent being Diana. She's known for her independence, virginity, bow & arrows, and association with stags and the moon. "Artemis" also names NASA's ambitious program to return humans to the Moon, aiming for future Mars exploration, featuring the Orion spacecraft and Space Launch System.