NASA prepares to send astronauts back to the Moon as part of the Artemis program, with the goal of eventually sending humans to Mars in the long term. The first spaceflight in this endeavor, Artemis-1, is expected to lift off without a crew on August 29 to fly in orbit around the Moon and back to Earth. But astronauts are already training at NASA's Johnson Space Center in Houston for subsequent lunar missions. "All of us should want to be on the next thing smoking," says NASA astronaut Victor Glover. IMAGES AND SOUNDBITES