For the first time in more than half a century, a crewed mission is headed beyond low Earth orbit toward the moon. On Wednesday, NASA’s Space Launch System boosted four astronauts into space, leaving long vapor trails across a clear Florida sky. The team on board and the ground crews are now working through the roughly 10-day mission profile.
Astronauts Reid Wiseman, Victor Glover and Christina Koch of NASA, together with Canadian Space Agency astronaut Jeremy Hansen, rode inside an Orion capsule mounted on the SLS rocket. The flight will send them on a roughly 230,000-mile round trip past the moon and back, serving as a key crewed test of Orion’s systems.
The mission will exercise life-support, maneuvering and other spacecraft functions and collect scientific data that will help shape future deep-space and lunar-surface operations.
Trajectory and approach
Artemis II uses a free-return trajectory: it stays largely under Earth’s gravitational influence, arcs past the moon, and then falls back toward Earth for splashdown. This route requires less propellant and limits some risks compared with inserting the spacecraft into lunar orbit.
About a day after liftoff, the vehicle will perform a translunar injection burn to send the crew on their lunar flyby. The flight will take them to roughly 5,000 miles above the lunar surface — far higher than Apollo missions, which typically orbited about 100 miles above or landed. Mission scientists say the far-side pass will present the moon as a long, distant swath of surface rather than close-up terrain.
In-orbit checks
After separating from the SLS booster but before committing to the translunar leg, the crew began evaluating Orion while it circulated in high Earth orbit. Within hours they performed proximity operations tests, taking manual control briefly to see how the spacecraft handles in space.
Pilot Victor Glover reported that the vehicle responded well during those checks, confirming handling characteristics that will be important for future missions that might require docking with a lunar lander. While docking is expected to be automated, engineers wanted to verify manual control options in case astronauts must intervene.
Scientific objectives
The astronauts themselves are subjects of biomedical studies: the mission will probe how extended travel farther into deep space affects the human body and how increased radiation exposure behaves. Tiny chips containing crew cells are distributed throughout the capsule to measure radiation effects with greater spatial detail.
Crew members will also act as field observers, photographing and describing features on the lunar far side that no human has seen close-up. Geologists on Earth trained the crew to spot distinctive surface features that will inform scientific analysis and future landing site selection. From the mission’s high altitude, the moon will appear more like a long aerial strip than the close-in views of prior missions.
Artemis II is also carrying CubeSats from Germany, South Korea, Saudi Arabia and Argentina. Those small satellites will study radiation effects on electronics and hardware, monitor space weather, and test how the lunar environment impacts electrical systems envisioned for future surface operations.
Return and recovery
On the way home, the Orion capsule will reenter Earth’s atmosphere at nearly 25,000 miles per hour. Atmospheric friction will heat the exterior to close to 3,000 degrees Fahrenheit, so the capsule depends on its heat shield for protection. After an uncrewed test flight in 2022 revealed unexpected heat-shield damage, NASA plans a steeper reentry angle for Artemis II to reduce the time spent in peak heating.
Once through peak heating, eight parachutes will deploy to slow the capsule for a Pacific Ocean splashdown off the coast of California. Airbags will help ensure the capsule comes to rest right-side up, and a recovery team at sea will retrieve the crew and conclude the mission.
Why this matters
Lessons learned on Artemis II are critical for the next flights in the Artemis program. Agency leadership has signaled plans to increase launch cadence and advance toward a permanent lunar surface presence — goals that depend on validating crewed systems and procedures during this mission.
As mission specialist Christina Koch put it, the team hopes this flight will mark the beginning of an era when people everywhere can see the moon not just as a distant object but as a reachable destination.