Nasa is gearing up for its big return to the lunar neighborhood, and the final rehearsal before the real show is about to begin.

Nasa is gearing up for its big return to the lunar neighborhood, and the final rehearsal before the real show is about to begin. The Artemis II mission, which will carry four astronauts on a 10-day journey around the Moon, is currently undergoing its most critical ground test. A wet dress rehearsal is a high-stakes technical run-through.