
Four astronauts are preparing to fly around the Moon later this year. It will be the first time human beings have traveled beyond low Earth orbit since December 1972, when Apollo 17’s crew splashed down in the Pacific and the curtain fell on an era. More than half a century of silence followed. Now NASA is attempting something that sounds deceptively simple: send a crew on a loop around the Moon and bring them home. No landing. No surface operations. Just a flyby.
Don’t let the simplicity fool you.
Artemis II, currently targeting a launch no earlier than late 2025 or early 2026 depending on readiness reviews, represents one of the most consequential test flights in NASA’s history. The mission will be the first crewed flight of the Space Launch System rocket and the Orion spacecraft together — a combination that flew once before, uncrewed, during Artemis I in late 2022. That mission revealed problems. Heat shield erosion behaved in ways engineers didn’t predict. Bolts holding the heat shield’s outer layer shed unexpectedly. And the life support system, which had no humans aboard to stress-test it, remains largely unproven in the deep-space environment where Artemis II will operate.
As Ars Technica reported in a detailed examination of the mission’s risk profile, the fundamental question hanging over Artemis II isn’t whether NASA can pull it off — it’s how much risk the agency and its astronauts are actually accepting, and whether that level of risk is being communicated honestly.
The heat shield issue alone would give any engineer pause. During Artemis I’s return, Orion’s Avcoat heat shield — a material with Apollo-era heritage — experienced what NASA has described as unexpected charring patterns and loss of material. Chunks of the ablative coating came off in ways that thermal models hadn’t predicted. NASA spent more than a year investigating, ultimately attributing the anomaly to gases trapped within the heat shield material that expanded and caused pieces to liberate during the intense heating of reentry. The agency says it now understands the phenomenon and has determined that Artemis II can fly safely with the existing heat shield design, though it has committed to a redesigned heat shield for Artemis III and beyond.
That’s a significant caveat. If the heat shield design needs to be changed for future missions, the implicit admission is that the current design is not optimal. NASA’s position is that the material loss observed on Artemis I, while unexpected, did not compromise the structural integrity of the heat shield and that adequate margins remain for a crewed reentry. Engineers have run additional thermal analyses and ground tests. They believe the risk is manageable.
Belief and certainty are different things.
The crew — NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen — will be flying a spacecraft that has carried humans exactly zero times. Every system that interacts with a crew will be operating in its true environment for the first time. The environmental control and life support system. The crew displays and interfaces. The manual flight control capability, which the astronauts are expected to demonstrate during a segment of the mission. The waste management system. All of it untested with actual human occupants in the thermal and radiation conditions of cislunar space.
This is not unprecedented in the history of spaceflight. Apollo’s first crewed mission beyond Earth orbit was Apollo 8 in December 1968, which sent three astronauts around the Moon on a spacecraft that had only flown with crew once before, in low Earth orbit. The Saturn V rocket that carried them had launched just twice — once successfully, once with significant problems including engine failures and structural oscillations. NASA made the call to go anyway, driven by Cold War urgency and intelligence suggesting the Soviet Union might attempt a circumlunar flight first.
The risk tolerance was different then. As Ars Technica noted, some estimates placed the probability of crew loss on Apollo missions in the range of 5% per flight. NASA administrator Jim Webb reportedly believed there was a one-in-four chance of losing a crew during the program. The astronauts themselves understood this. They flew anyway.
Today’s NASA operates under a fundamentally different set of expectations. The agency’s own probabilistic risk assessments for the Space Shuttle, conducted after the Columbia disaster, suggested loss-of-crew probabilities on the order of 1 in 90 for early shuttle flights. For the Commercial Crew Program — SpaceX’s Crew Dragon and Boeing’s Starliner — NASA set a requirement of no worse than 1 in 270 chance of loss of crew. The agency has not publicly released a comparable number for Artemis II.
That silence is telling.
NASA officials have said publicly that they believe Artemis II’s risk level is acceptable and consistent with the agency’s standards for human spaceflight. But the specifics remain closely held. Part of the reason is institutional: publishing a precise probability invites public debate about whether that number is “safe enough,” a conversation NASA would rather have internally. Part of it is technical: the models used to generate these numbers carry their own uncertainties, and a single figure can be misleading without extensive context.
But there’s also a political dimension. Artemis is the centerpiece of NASA’s human exploration strategy. Billions of dollars have been spent. Contracts with Boeing, Lockheed Martin, Northrop Grumman, and others are deeply embedded in the industrial base. Congressional delegations in Alabama, Louisiana, Florida, Texas, and other states have strong interests in the program’s continuation. Acknowledging elevated risk — even risk that falls within historically accepted bounds — creates ammunition for critics who argue the program is too expensive, too slow, or too dangerous.
And Artemis has no shortage of critics. The SLS rocket, a government-designed and government-built vehicle derived from Space Shuttle components, costs roughly $2.5 billion per launch by most independent estimates, though NASA has resisted confirming a precise per-flight figure. It is expendable — each rocket is used once and destroyed. SpaceX’s Starship, by contrast, is designed to be fully reusable and, if it achieves its cost targets, could launch for a fraction of SLS’s price. Starship is, in fact, a critical part of the Artemis architecture: a modified version called the Human Landing System is supposed to carry astronauts from lunar orbit to the surface on Artemis III.
So NASA finds itself in the awkward position of relying on two very different vehicles built by two very different philosophies — one a government cost-plus megaproject, the other a commercial venture iterating through rapid prototyping and occasional spectacular failures — to accomplish a single goal. The tension between these approaches is real and ongoing.
None of this changes the immediate question facing the Artemis II crew and the engineers supporting them. The mission profile itself is relatively conservative by Apollo standards. Orion will launch atop SLS from Kennedy Space Center’s Pad 39B, enter a high Earth orbit, receive a trans-lunar injection burn from the SLS upper stage, coast to the Moon, perform a free-return trajectory that swings behind the lunar far side, and return to Earth for a splashdown in the Pacific. Total mission duration is approximately 10 days. No orbital insertion at the Moon. No docking with another spacecraft. No landing attempt.
The free-return trajectory is a deliberate risk-reduction choice. If the Orion spacecraft’s service module engine fails after the trans-lunar injection burn, the laws of orbital mechanics will bring the capsule back to Earth without any additional propulsive maneuver. Apollo 13 used a variant of this principle to survive its catastrophic oxygen tank explosion in 1970. It’s a built-in safety net, and it’s one of the reasons NASA chose this mission profile for the first crewed flight.
But the free-return trajectory doesn’t protect against every failure mode. A breach of the crew cabin’s pressure vessel would be fatal regardless of trajectory. A failure of the heat shield during reentry — the scenario that has drawn the most scrutiny — would be catastrophic. A loss of electrical power or life support could turn a 10-day mission into a survival scenario with very limited margins. And the radiation environment between Earth and the Moon, while generally manageable for a short-duration mission, poses a risk during solar particle events that could deliver dangerous doses to the crew if a major solar flare occurs during the transit.
Orion does carry a small radiation shelter area where crew members can huddle during a solar event, using equipment and supplies as additional shielding. NASA has studied this scenario extensively. The protection is adequate for most events but not for the most extreme solar particle storms, which are rare but not impossible. The mission is timed to avoid the predicted peak of Solar Cycle 25, though solar activity forecasting remains an imprecise science.
There’s another factor that receives less public attention: the abort options during launch and ascent. SLS does not carry a traditional launch escape system in the way that Apollo’s Saturn V did, with a tower-mounted solid rocket pulling the capsule away from a failing booster. Instead, Orion has its own Launch Abort System — a set of solid rocket motors mounted on a tower atop the capsule that can pull it free during the first couple of minutes of flight. After that, Orion relies on its own service module engine and the separation capability from SLS to execute abort scenarios at various points during ascent. These abort modes have been analyzed extensively but never tested in an actual emergency. The Launch Abort System was tested once, in an uncrewed pad abort test in 2019 at White Sands, New Mexico. It worked. But an ascent abort — pulling away from a rocket that is actively failing while traveling at high speed through the atmosphere — has never been demonstrated.
This is standard for new crewed vehicles. SpaceX’s Crew Dragon conducted an in-flight abort test in January 2020, deliberately triggering separation from a Falcon 9 at the point of maximum aerodynamic pressure. It succeeded. Boeing’s Starliner has not conducted an in-flight abort test, though its pad abort test in 2019 experienced a partial parachute deployment failure. NASA accepted the risk of flying Starliner without a dedicated in-flight abort demonstration.
Risk acceptance is, ultimately, a human decision made under uncertainty. Engineers can model failure scenarios, calculate probabilities, test components, and run simulations. But spaceflight — particularly on new vehicles — always carries unknowns that models can’t fully capture. The “unknown unknowns,” as former Defense Secretary Donald Rumsfeld once put it in a different context, are what keep flight directors awake at night.
The astronauts themselves appear to accept this reality with the equanimity characteristic of their profession. Reid Wiseman, the mission commander, is a Navy test pilot and veteran of a long-duration stay on the International Space Station. Victor Glover flew to the ISS aboard SpaceX’s Crew Dragon on its first operational mission. Christina Koch holds the record for the longest single spaceflight by a woman. Jeremy Hansen, while a spaceflight rookie, is a former CF-18 fighter pilot. These are people who have spent their careers evaluating and accepting calculated risk.
But their willingness to fly does not absolve NASA of the responsibility to be transparent about what that risk actually is. As Ars Technica’s analysis emphasized, the agency’s reluctance to discuss specific risk numbers for Artemis II stands in contrast to the relative openness it has shown about risk assessments for other programs. After Columbia, NASA published detailed probabilistic risk assessments for remaining shuttle flights. The Commercial Crew Program’s safety requirements, including the 1-in-270 loss-of-crew threshold, are public. For Artemis, the numbers are harder to find.
One reason may be that the numbers aren’t flattering. A new rocket, a spacecraft with one uncrewed test flight, a heat shield that behaved unexpectedly, life support systems untested in their operational environment, and abort modes that have never been exercised in real conditions — all of these factors push the probability of loss of crew higher than what NASA has accepted for routine ISS crew rotation flights. How much higher is the question NASA doesn’t seem eager to answer publicly.
It is worth placing this in historical context. Every first crewed flight of a new American spacecraft has carried elevated risk. John Glenn’s Mercury-Atlas 6 mission in 1962. Gus Grissom and John Young’s Gemini 3 in 1965. The first crewed Apollo flight, Apollo 7, in 1968 — which came after the Apollo 1 fire killed three astronauts during a ground test. The first Space Shuttle mission, STS-1, in 1981, which launched with a crew aboard a vehicle that had never flown to space at all. Doug Hurley and Bob Behnken’s Demo-2 mission on Crew Dragon in 2020. In each case, the crew and the agency accepted risk that was higher than what subsequent missions would carry, because someone has to go first.
Artemis II is that flight for the Artemis program. And the stakes extend beyond the four people in the capsule. A successful mission validates the SLS-Orion architecture, builds confidence for the far more complex Artemis III lunar landing mission, and sustains political and public support for a program that has already consumed decades and tens of billions of dollars. A failure — particularly a fatal one — would be devastating. Not just for the families of the crew, but for NASA as an institution and for the broader cause of human space exploration. The political fallout from a crew loss on Artemis II would almost certainly ground the program for years, if not permanently.
NASA knows this. The agency’s leadership, from Administrator Bill Nelson on down, has repeatedly stated that they will not fly until they are ready and that safety is the top priority. These are the right words. The question is whether the institutional pressures — schedule, budget, political expectations, contractor relationships — create subtle incentives to declare readiness before every concern has been fully resolved.
The history of spaceflight suggests this is not a theoretical concern. The Rogers Commission found that NASA managers overrode engineering objections to launch Challenger in cold weather. The Columbia Accident Investigation Board found that organizational culture and schedule pressure contributed to the decision to fly with known foam-shedding risks. In both cases, the agency’s own internal processes failed to prevent catastrophe.
NASA has implemented significant safety reforms since Columbia, including the creation of an independent safety oversight structure and a stronger role for the chief safety officer. The Aerospace Safety Advisory Panel, an independent body that reports to Congress and the NASA administrator, has been closely monitoring Artemis development and has raised concerns about schedule pressure and workforce fatigue at various points. Whether these safeguards are sufficient to prevent the kind of normalization of risk that contributed to past disasters is something that can only be judged in retrospect.
For now, the Artemis II crew continues to train. Engineers continue to analyze data, close out action items, and prepare the hardware at Kennedy Space Center. The SLS rocket and Orion spacecraft are being stacked and tested. Review boards will convene. Flight readiness reviews will be conducted. And at some point, if all the boxes are checked and all the concerns are addressed to the satisfaction of the people responsible for the decision, four human beings will strap into a capsule atop the most powerful rocket in operation, light the engines, and head for the Moon.
It will be dangerous. How dangerous, exactly, is something NASA would prefer to discuss in qualitative rather than quantitative terms. The astronauts will trust the engineers. The engineers will trust their analysis. And the rest of us will watch, knowing that for all the technology and all the testing and all the reviews, spaceflight remains an inherently hazardous undertaking — one where the margin between triumph and tragedy can be measured in millimeters of heat shield ablator or milliseconds of reaction time.
Fifty-four years is a long time to be away from the Moon. Getting back was never going to be easy. And it was never going to be safe.
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