NASA announced the names of the 18 astronauts that will start training for its new moon mission, Artemis. Of the 18, half are women. One of them will be the first woman to walk on the moon. Safety is a big concern. Landing on the moon is no easy feat. Returning is even harder—and dangerous. But the astronauts are eager for the challenge. The program aims to have humans back on the moon by the end of the decade. NASA hopes to build a long-term presence on the moon. The Artemis missions will study the lunar surface and determine if this is possible and how to achieve it.