NASA is preparing to launch the Artemis II mission as early as Wednesday, sending four astronauts on a 10-day journey around the moon. The mission represents a crucial milestone in the agency's broader Artemis program aimed at returning humans to lunar orbit and eventually to the moon's surface.

The Artemis II crew will travel aboard NASA's Orion spacecraft, which will carry them on a trajectory around the moon before returning to Earth. This mission follows the successful uncrewed Artemis I test flight, which validated the spacecraft's systems and heat shield capabilities during a similar lunar flyby.

The 10-day mission duration will allow the crew to test various spacecraft systems and procedures that will be essential for future lunar landing missions. The flight plan includes multiple orbital maneuvers and system checks designed to demonstrate Orion's readiness for longer-duration missions.

Artemis II marks the first time humans will travel beyond low Earth orbit since the Apollo 17 mission in 1972. The mission serves as a precursor to Artemis III, which NASA plans as the first crewed lunar landing since the end of the Apollo program.

The launch timing depends on various factors including weather conditions and technical readiness. NASA has been conducting final preparations and system checks as the mission approaches its earliest possible launch date.