How many days is NASA's Artemis II mission planned to last?

NASA's Artemis II mission is meticulously planned for a duration of ten days, a critical timeframe designed to test vital systems and procedures for future deep space exploration. This historic flight marks the first time humans will venture beyond low Earth orbit since the Apollo program concluded in 1972, serving as a crucial stepping stone in humanity's return to the Moon and eventual journey to Mars. The 10-day itinerary allows the four-person crew to thoroughly evaluate the Space Launch System (SLS) rocket and the Orion spacecraft's performance with astronauts on board.

During these approximately ten days, the crew, consisting of NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen, will undertake a series of complex maneuvers. After launching and achieving Earth orbit, Orion will perform a translunar injection burn to set its course for the Moon. The mission involves a lunar flyby, where the spacecraft will loop around the Moon on a free-return trajectory, reaching a closest approach of approximately 4,047 miles from the lunar surface. This journey provides essential opportunities to test life support, navigation, and communication systems in the deep space environment.

The 10-day duration is essential for gathering critical data on how Orion's systems perform with a crew onboard, ensuring their safety and readiness for longer missions. This includes testing emergency procedures and experiencing the deep-space radiation environment. Artemis II is a foundational mission for the broader Artemis program, which aims to land the first woman and first person of color on the lunar surface, establishing a sustainable presence at the Moon as a prelude to human missions to Mars.