Artemis II

• 1. From Asteroid To Moon

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  In April 2017, NASA canceled the Asteroid Redirect Mission. This decision forced a complete rewrite of Exploration Mission-2 plans. The agency had originally designed a single-launch mission to rendezvous with an asteroid placed in lunar orbit by a robotic spacecraft. Astronauts were scheduled to perform spacewalks and gather samples from that captured rock. Without that target, planners proposed an eight-day free-return trajectory around the Moon instead. Another proposal suggested delivering the first element of the Deep Space Gateway on an eight-to-twenty-one day trip. By March 2018, officials decided to launch the first Gateway module on a commercial SpaceX Falcon Heavy rocket due to delays in building the Mobile Launcher. The objectives shifted from capturing asteroids to testing human endurance during a lunar flyby.

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• 2. Building The Rocket

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  On the 11th of February 2023, engineers rotated the Artemis II core stage engine section into a horizontal position. This marked the final major milestone before integration with the rest of the vehicle. On March 20, the engine section mated with the core stage in Building 103 at the Michoud Assembly Facility in New Orleans. RS-25 engines with serial numbers E2047, E2059, E2062, and E2063 were installed by the 25th of September 2023. A leak discovered in oxygen valve hydraulics forced the replacement of engine E2063 with E2061 in April 2025. NASA initially expected to deliver the completed core stage to Kennedy Space Center in summer 2023 but delayed that timeline to late autumn 2023. Fully outfitted core stage delivery occurred between July 16 and 25, 2024. Adapters for integration reached substantial completion in June 2024 and arrived at KSC in September 2024. Stacking operations began on the 20th of November 2024, after delays caused by life support system investigations.

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• 3. The Shifting Calendar

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  Preliminary reviews in 2011 placed the launch date somewhere between 2019 and 2021. The schedule later shifted to 2023 before being pushed again. In January 2024, officials expected a September 2025 launch. However, an October 2024 report from the NASA Office of Inspector General determined the Exploration Ground Systems team had exhausted time reserved for unforeseen issues. Outgoing administrator Bill Nelson announced in December 2024 that engineering investigations into life support systems and heat shield damage would delay the mission. By March 2025, reports suggested acceleration to February 2026. NASA stated they were looking for ways to enable an earlier launch while maintaining crew safety as the top priority. Space agency officials announced in September 2025 that they were pursuing a launch window opening on the 5th of February 2026. A North American winter storm delayed preparations further. As of the 30th of January 2026, Artemis II will launch no earlier than February 8.

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• 4. Shielding The Crew

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  Following the uncrewed Artemis I mission in November 2022, NASA identified unexpected erosion of the Orion spacecraft's ablative heat shield after atmospheric reentry. Post-flight inspections found areas of char loss in the AVCOAT material where portions eroded more extensively than predicted by preflight models. Close-up imagery of the damage did not appear publicly until May 2024 within a report by the NASA Office of Inspector General. An independent review team established in April 2024 concluded its assessment in December 2024. Engineers determined the char loss was caused by gases becoming trapped within the AVCOAT material, leading to cracking and localized material loss during reentry. Rather than replacing the heat shield, NASA elected to modify the reentry trajectory by increasing the descent angle. This change reduces the time the spacecraft spends in the thermal environment associated with the damage. NASA stated modeling indicated this would limit further char loss while remaining within structural margins.

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• 5. The Four Chosen

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  NASA Administrator Bill Nelson announced the Artemis II crew on the 3rd of April 2023, during his State of NASA address at Ellington Field outside Houston. Commander Reid Wiseman, pilot Victor Glover, and mission specialist Christina Koch joined Canadian Space Agency astronaut Jeremy Hansen for the flight. On the 22nd of November 2023, Jenni Gibbons was named as Hansen's backup. Andre Douglas became the backup for the three NASA astronauts on the 3rd of July 2024. Glover will become the first person of color to travel around the Moon. Koch becomes the first woman to do so. Hansen is the first non-American to leave low Earth orbit and travel around the Moon. Hansen and Gibbons were selected by the Canadian Space Agency under a 2020 treaty between the United States and Canada that facilitated their participation in the program.

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• 6. Ten Days In Flight

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  The mission profile involves multiple departure burns sending Orion into a high Earth orbit with a period of roughly 24 hours. During this time, the crew performs checkouts of life support systems and an in-space rendezvous demonstration using the spent Interim Cryogenic Propulsion Stage. When Orion reaches perigee again, it fires its main engine to complete the translunar injection maneuver. This sends the spacecraft onto a lunar free-return trajectory before returning to Earth. The outbound journey and lunar flyby take about four days. Orion flies around the Moon at a closest approach of approximately 136 kilometers from the far-side lunar surface. The return flight takes another four days with further trajectory correction burns to ensure accurate Earth re-entry. Splashdown occurs in the Pacific Ocean off San Diego where the U.S. Navy recovers the crew and spacecraft.

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• 7. Science And Satellites

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  Artemis II will test optical communications to and from Earth using the Orion Artemis II Optical Communications System. The hardware includes an optical module with a telescope and two gimbals plus a modem and control electronics. Ground stations in California and New Mexico receive data at downlink rates up to 260 megabits per second. NASA also flies payloads titled AVATAR and ARCHAR to study crew health during deep space travel. AVATAR mimics individual astronaut organs outside the International Space Station and Van Allen Belt. ARCHAR involves crew members wearing movement and sleep monitors to study real-time health and behavioral information. Scientists test immune biomarkers by collecting saliva samples before, during, and after the mission. Five CubeSats from international partners including Germany, Argentina, Korea, and Saudi Arabia are bound for high Earth orbit. These payloads advance global scientific research while broadening international access to deep space.

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