Artemis II

• 1. Introduction

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  Artemis II launched on the 1st of April 2026, carrying four astronauts away from Earth for the first time in more than fifty years. The last crew to travel this far from home had boarded Apollo 17 in 1972. For everyone born after that mission, human presence beyond low Earth orbit had been a matter of history, not lived experience. About three-quarters of the world's population had grown up in an era when no one went to the Moon.

  The spacecraft was named Integrity by its crew. It flew a free-return trajectory around the far side of the Moon, swinging past at a closest approach of roughly 4,067 miles from the lunar surface. At 23:02 UTC on the 6th of April, Integrity reached a distance of 252,756 miles from Earth, surpassing Apollo 13's record of 248,655 miles set in 1970.

  Four firsts were made in a single mission. Victor Glover became the first person of color to travel beyond low Earth orbit. Christina Koch became the first woman. Jeremy Hansen, representing the Canadian Space Agency, became the first non-American. Reid Wiseman became the oldest person to make the journey. Their mission lasted ten days, beginning with a launch from Kennedy Space Center and ending with a splashdown in the Pacific Ocean southwest of San Diego.

  What follows is the story of how that mission came to exist, what it took to get off the ground, what happened in the ten days the crew spent in deep space, and what it meant to the people watching from below.

• 2. A Long Road to Launch

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  During preliminary reviews in 2011, planners placed the launch somewhere between 2019 and 2021. By the time Integrity finally lifted off in April 2026, the mission was roughly five years late.

  The original concept had nothing to do with the Moon. Designated Exploration Mission-2, the flight was conceived to rendezvous with an asteroid that would have been dragged into lunar orbit by a robotic tug called the Asteroid Redirect Mission. Astronauts would have conducted spacewalks and collected samples from that asteroid. When the Asteroid Redirect Mission was cancelled in April 2017, the entire rationale for the flight evaporated.

  NASA proposed a replacement plan almost immediately: an eight-day free-return trajectory around the Moon with four crew members aboard Orion. A separate 2017 proposal floated a longer mission of 8 to 21 days to deliver the first module of a planned Lunar Gateway space station. That idea also fell through. The Gateway's initial module was assigned to a commercial rocket, and by March 2026 the Lunar Gateway program itself was cancelled.

  Hardware development ran into its own complications. The four RS-25 engines designated for the core stage were installed by the 25th of September 2023, but a leak in the oxygen-valve hydraulics forced engineers to swap one of them out in April 2025, replacing engine E2063 with E2061. The completed core stage was delivered to Kennedy Space Center between the 16th and the 25th of July 2024.

  Rocket stacking was supposed to begin in September 2024. It started instead on the 20th of November, pushed back by investigations into Orion's life-support system and unexpected damage to the heat shield discovered after the uncrewed Artemis I mission. Stacking was not completed until the 20th of October 2025.

• 3. The Heat Shield Problem

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  After Artemis I reentered Earth's atmosphere in November 2022, engineers found something they had not predicted. Sections of the AVCOAT ablative material on Orion's heat shield had eroded more extensively than preflight models suggested they would. Temperatures inside the crew module stayed within design limits, but the behavior of the material itself raised questions.

  Close-up imagery of the damage was not publicly released until May 2024, when it appeared in a report from the NASA Office of Inspector General. In April 2024, NASA stood up an independent review team to evaluate the shield's performance. The review concluded in December 2024, and NASA announced it would fly Artemis II without replacing the heat shield.

  Engineers determined that hot gases had become trapped within the AVCOAT material, causing spalling, cracking, and concentrated material loss during reentry. Rather than redesign the shield, NASA modified the reentry trajectory by increasing the descent angle. The steeper path reduced how long the spacecraft would spend in the thermal environment where the damage had occurred.

  The publicly released version of the review team's report was heavily redacted. Former NASA engineers and astronauts criticized the lack of transparency. In January 2026, NASA administrator Jared Isaacman stated he supported proceeding after reviewing the agency's analysis and meeting with engineers and outside experts. Some participants who had earlier expressed concerns said the additional data answered their questions. Others continued to object to flying without a redesigned shield.

  NASA has said that design changes addressing AVCOAT permeability are planned for the heat shield intended for Artemis III. In practice, the solution chosen for Artemis II was a different flight path rather than a different component.

• 4. Getting Off the Ground

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  The January 2026 North American winter storm disrupted launch preparations before the crew ever reached the pad. On the 18th of January 2026, the integrated SLS rocket, Orion capsule, and launch tower rolled out from the Vehicle Assembly Building to Launch Complex 39B.

  A wet dress rehearsal on the 2nd of February revealed a liquid hydrogen leak during the simulated countdown. A valve associated with the Orion crew module hatch pressurization also required retorquing, and closeout operations ran longer than planned. NASA postponed the launch to March. A second dress rehearsal on the 19th of February was successful.

  Two days later, on the 21st of February, a helium flow issue triggered a rollback to the Vehicle Assembly Building. The rollback began at 9:38 a.m. EST on the 25th of February. The integrated rocket arrived back at the VAB at roughly 8:00 p.m. that same day.

  On the 12th of March, after a Flight Readiness Review, NASA announced seven two-hour launch windows for the period from the 1st through the 6th of April and again on the 30th of April. On the 20th of March, after a delay due to high winds, the SLS rolled out from the VAB to launch pad 39B for the second time.

  The crew arrived at Kennedy Space Center on the 27th of March. The launch countdown began on the 30th. At 22:35:12 UTC on the 1st of April, the four RS-25 main engines ignited roughly seven seconds before liftoff. The solid rocket boosters, whose ignition cannot be reversed, fired at T-0. Booster separation occurred at approximately 3,100 mph at an altitude of 30 miles. It was the first crewed launch from Launch Complex 39B since STS-116 in 2006.

• 5. Ten Days in Deep Space

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  Immediately after main-engine cutoff, Christina Koch and Jeremy Hansen unstrapped from their seats to check the life support systems: the water dispenser, firefighting masks, and the toilet. Both the toilet and water dispenser had minor issues, which the crew resolved before mission managers authorized the next engine burn.

  Victor Glover, in the left seat, took manual control of Orion during a roughly 70-minute proximity operations demonstration using the spent Interim Cryogenic Propulsion Stage as a maneuvering target. The exercise gave engineers data on the spacecraft's handling qualities and rehearsed docking techniques for future missions.

  On flight day 2, Orion performed a 5-minute, 49-second trans-lunar injection burn using the AJ10 main engine, consuming approximately 1,000 pounds of hypergolic propellant. It was the only use of that engine during the entire mission. On flight day 3, a frozen toilet vent line became a minor crisis. Urine had frozen in the vent, blocking ejection into space. The crew solved it by activating vent heaters and rotating the spacecraft to expose the frozen section to sunlight.

  On flight day 6, Orion flew around the far side of the Moon. The crew experienced a planned communications blackout of 40 minutes beginning at 22:46 UTC. During the flyby, Koch and Wiseman observed two unnamed craters and proposed naming one Integrity, after their spacecraft, and one Carroll, after Wiseman's late wife, who died of cancer in 2020.

  After the blackout ended, a solar eclipse began at 01:35 UTC and lasted 57 minutes. The crew wore eclipse glasses until the Sun was fully obscured, then watched the solar corona, observed impact flashes from meteoroids striking the dark portion of the lunar surface, and saw Venus, Mars, Saturn, and Mercury alongside the corona.

  On flight day 8, a planned manual control test was cancelled so engineers could gather data on a small helium leak in the European Service Module. The leak posed no safety risk, but the data was expected to guide propulsion system changes for later missions. On flight day 10, Integrity reentered at a maximum velocity of about 24,664 mph and splashed down at 00:07:27 UTC on the 11th of April, in the Pacific Ocean southwest of San Diego. The U.S. Navy recovered the crew, marking the first Navy recovery of a NASA crew since the Apollo-Soyuz Test Project in 1975.

• 6. The Crew and Their Firsts

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  Reid Wiseman served as commander. Victor Glover flew as pilot. Christina Koch and Jeremy Hansen served as mission specialists. Hansen was making his first spaceflight. On the 22nd of November 2023, Jenni Gibbons was named as Hansen's backup. On the 3rd of July 2024, Andre Douglas was named as the backup for the three NASA astronauts.

  Hansen's place on the crew was rooted in diplomacy as much as astronaut selection. He and backup Gibbons were both Canadians chosen by the Canadian Space Agency under a 2020 treaty between the United States and Canada, an agreement designed to give Canadian astronauts a seat in the Artemis program.

  The four crew members collectively set records that had stood since the Apollo era. Breaking the record for the most people in deep space at once meant surpassing the three-person crew of Apollo 8, who set that mark in December 1968. Wiseman, by being the oldest person to travel beyond low Earth orbit, added a personal milestone to the mission's broader list of achievements.

  During their flyby, the crew contributed something more personal to the mission's legacy. The proposal to name a crater Carroll was a quiet tribute, spoken from a distance of more than 250,000 miles from Earth, to someone Wiseman had lost.

  Rise, the zero-gravity indicator that floated loose inside Integrity during the mission, was a plush toy designed by Lucas Ye, an eight-year-old from Mountain View, California, whose entry won a NASA design competition that drew more than 2,600 submissions from over 50 countries, with a total of US$23,275 awarded to the winner and finalists. An SD card sewn inside Rise held the names of members of the public who had signed up through NASA's online boarding pass program. At the end of the mission, Wiseman said he felt bad leaving Rise aboard the spacecraft and tucked it into his dry bag instead.

• 7. Science and Technology Onboard

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  Artemis II carried two health-monitoring payloads that extended what had previously been done only inside the International Space Station and within Earth's Van Allen radiation belt. AVATAR, short for A Virtual Astronaut Tissue Analog Response, mimics individual astronaut organs and was being operated in deep space for the first time. ARCHeR, the Artemis Research for Crew Health and Readiness package, had crew members wearing movement and sleep monitors before, during, and after the mission to build a real-time record of health and behavioral data.

  The mission also tested the Orion Artemis II Optical Communications System, known as O2O, which uses laser beams rather than conventional radio. The hardware was lighter and smaller than radio equivalents and could transmit data at an uplink rate of up to 260 megabits per second, communicating with ground stations in California and New Mexico. The O2O optical module included a four-inch telescope and two gimbals.

  Four CubeSats from international partners flew as secondary payloads, selected from nations that had signed the Artemis Accords. Germany's TACHELES examined how space conditions affect electrical components used in lunar vehicles. Argentina's ATENEA, from the National Space Activities Commission, studied radiation shielding; it completed its mission objectives but burned up after a single orbit, having never been designed to sustain itself. South Korea's K-RadCube, from the Korea AeroSpace Administration, tested a material simulating human tissue for the effects of space radiation. Saudi Arabia's SHAMS, meaning "Sun" in Arabic and submitted by the Saudi Space Agency, measured space weather in high Earth orbit; it was the only one of the three propulsion-equipped CubeSats that successfully raised its perigee and remained in orbit.

  NASA's wake-up call tradition, which began during the Gemini program and first used music to rouse a crew during Apollo 15, took a new form with Artemis II. The mission became the first NASA flight to have its wake-up songs compiled into an official Spotify playlist. Jim Lovell recorded his greeting for the crew shortly before his death in August 2025.

• 8. Moon Joy and Its Aftermath

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  NASA coined the phrase "Moon joy" during the mission, defining it in a social media post as "the feeling of intense happiness and excitement that only comes from a mission to the Moon." The agency had not predicted the scale of public response. Artemis II was not widely anticipated before launch, but worldwide interest climbed rapidly in the days after liftoff.

  Public engagement during the mission was described as an example of collective effervescence, driven in part by the crew's personal and inclusive style of communication. Their live descriptions of the eclipse, the impact flashes, and the view of Venus and Saturn alongside the solar corona reached an audience that, at the time of the mission, had never lived through a crewed lunar mission; roughly three-quarters of the global population was born after Apollo 17.

  Misinformation spread alongside the genuine public excitement. Conspiracy theorists shared AI-generated videos claiming the mission was fabricated. An enhanced photograph amplifying color variations in the lunar surface caused by iron and titanium deposits circulated online and was falsely attributed to the Artemis II crew. The image had actually been taken in August 2025 by Ukrainian amateur astrophotographer Ildar Ibatullin.

  In quarantine before launch, the crew watched Project Hail Mary, a 2026 film that the media compared to crewed spaceflight programs like Artemis. Ryan Gosling, who played the lead, appeared in a pre-recorded message at launch on the NASA live broadcast. Spotify reported that several of the mission's wake-up songs saw significant stream increases after airing: "Sleepyhead" by Young and Sick peaked at a 2,100% increase on the 5th of April, and "Working Class Heroes (Work)" by CeeLo Green saw an increase of more than 1,700%. Those numbers are a rough measure of how many people were paying attention, tuning in each morning to hear what the crew would wake up to next, 252,756 miles from home.