The 322-foot rocket is fueled. The four astronauts are in quarantine. The countdown clock is running. As soon as April 1, 2026, NASA will attempt something it hasn't done in more than half a century: send human beings to the vicinity of the Moon.
Artemis II is, by any measure, a historic mission. It will be the first crewed deep-space flight since Apollo 17 in December 1972. It will carry the farthest humans have ever traveled from Earth. It will serve as the practical rehearsal for a planned lunar landing that NASA insists is still coming.
It is also, undeniably, a program in crisis — or at least under enormous pressure to justify itself.
The Bill: $44 Billion and Climbing
The Space Launch System rocket and the Orion spacecraft have together cost more than $44 billion to develop, according to NBC News. That figure includes nearly $24 billion for the SLS through the uncrewed Artemis I test flight in 2022, and more than $20 billion for Orion from its initial development in 2006 through that same milestone, according to figures compiled by The Planetary Society, a nonprofit space research and advocacy organization.
The program was originally supposed to launch in 2016 at a cost of $5 billion for the rocket alone, according to Casey Dreier, chief of space policy at The Planetary Society. The launch did not happen in 2016. Or 2017. Or 2018, or any of the years after that.
A 2021 audit by NASA's Office of Inspector General projected the total Artemis program cost at $93 billion through fiscal year 2025. A separate 2023 report from the Government Accountability Office found that senior NASA officials described the Space Launch System as unsustainable "at current cost levels," according to NBC News.
The operating cost per launch has been estimated at $4.1 billion — for a single flight. By contrast, SpaceX's Falcon Heavy, the most powerful currently operational commercial rocket, charges approximately $150 million per launch.
Why It Costs This Much
The answer lies in decisions made more than 15 years ago. When NASA retired its space shuttle fleet in 2010 and 2011, Congress authorized the Space Launch System as a successor — and, crucially, designed it to preserve the existing shuttle workforce and contractor base.
The rocket uses upgraded versions of the shuttle's RS-25 main engines and employs the same contractors who built the shuttle for decades. Senators from Florida, Alabama, and Utah lobbied to protect jobs in their states, and the SLS became the product of political accommodation as much as engineering optimization, according to Dreier.
"If you think about it, this is not a 15-year-old program. This is a 50-year-old program," Dreier told NBC News. "This is the same workforce and same contractors going back to the '70s."
That heritage also explains one of the persistent technical problems: hydrogen leaks. The shuttle was designed to be reusable and used liquid hydrogen as fuel, which requires extraordinarily tight containment because hydrogen molecules are among the smallest in existence. Leaks delayed Artemis I in 2022 and caused delays to Artemis II earlier this year as well.
The Heat Shield Problem
Of the technical concerns surrounding this mission, the heat shield is the one that has drawn the most public scrutiny.
During the uncrewed Artemis I test flight in December 2022, NASA found unexpected damage to a critical thermal protection layer on the Orion capsule's bottom surface — the part that must withstand temperatures up to 5,000 degrees Fahrenheit during atmospheric re-entry. An investigation found that gases built up in the shield's outer material and did not vent properly, causing pressure to accumulate and parts of the charred material to break off, according to NASA's own account of the investigation.
Future heat shields will have a design fix: a more permeable outer layer that allows gases to vent properly. But for Artemis II, the heat shield is the same unmodified design that failed on Artemis I.
NASA's workaround is a different re-entry path. Normally, Orion would perform a "skip entry" — briefly dipping into the atmosphere before popping back up, like a stone skipping on water, to reduce heat stress. For Artemis II, the capsule will instead descend directly at a steeper angle, spending less time at peak temperatures.
NASA Administrator Jared Isaacman said in January he had "full confidence" in the heat shield under the revised plan. Astronaut Reid Wiseman, the mission's commander, offered a more conditional assessment: "If we stick to the new re-entry path that NASA has planned, then this heat shield will be safe to fly," he said at a media event in July, according to NBC News.
Scott Pace, director of the Space Policy Institute at George Washington University and a former executive secretary of the National Space Council, noted that the re-entry is ultimately what the scientific community will be watching most closely. "We're going to look at how it reenters the atmosphere and how it handles the heat load put on it," Pace told The Conversation. "The heat shield has had a long and complicated history. It looks like it'll be safe, but this is a flight test."
What Artemis II Actually Does
The mission profile calls for a 10-day flight that sends the four-person crew — NASA astronauts Reid Wiseman, Christina Koch, and Victor Glover, plus Canadian Space Agency astronaut Jeremy Hansen — into a high lunar flyby.
This is not a landing. The crew will loop around the Moon using its gravity to redirect their trajectory back to Earth — similar in concept to the emergency Apollo 13 abort procedure, according to Pace. They will not fire engines to enter lunar orbit, which makes the mission less operationally risky than Apollo 8, which did orbit the Moon. But Artemis II will take the crew farther from Earth than any human has ever traveled.
Before committing to the translunar injection burn that sends the crew toward the Moon, astronauts will spend time in Earth orbit conducting checks of the spacecraft's environmental control and life support system — a system that has not yet been fully flight-tested inside Orion, according to Pace.
If all goes well, the mission will validate the SLS rocket and Orion capsule for crewed operations and provide data needed to clear the heat shield for future flights with the redesigned version.
The China Factor
Behind every budget hearing and every schedule slip runs a quieter but increasingly urgent subtext: China's human spaceflight program is catching up.
China's lunar ambitions have expanded significantly in recent years. Its Chang'e robotic program has successfully returned lunar samples. Its crewed program is targeting lunar landing by the end of this decade. NASA Administrator Isaacman invoked the competition directly at a March NASA event: "The clock is running in this great-power competition, and success or failure will be measured in months, not years," he said, according to NBC News.
Isaacman also announced that NASA plans to spend $20 billion building a lunar base — an objective that requires Artemis II to succeed, Artemis III to land humans on the Moon, and the entire program to remain politically viable in the years ahead.
Pace offered a more measured view of the race framing. "It matters to me if China is the only one showing up and they drive all the standards and the operating norms on the Moon," he told The Conversation. "But the issue of beating China back in the near term doesn't quite seize me as much as the longer term."
What he found more concerning was the broader dynamic: the U.S. needs to establish norms and standards for lunar operations that reflect open, rules-based principles — "before China establishes its own," as Pace put it.
The Political Math
Artemis enjoys unusual bipartisan support in Congress, largely because its jobs are spread across multiple states with powerful senators. That political insulation has shielded the program from the budget-cutters who have targeted other government programs — but it has also, critics argue, prioritized workforce preservation over cost-efficiency.
Some analysts and former astronauts have argued NASA should pivot to more commercially competitive options — particularly SpaceX's Starship, which is developing a lunar lander variant under Artemis contract, but whose rocket costs a fraction of the SLS per flight. Others have argued the U.S. should skip the Moon entirely and aim for Mars.
Former NASA deputy administrator Pamela Melroy, who served from 2021 to 2025, pushed back on both arguments. "I've always thought it was not a race for boots on the moon, because we won that race more than 50 years ago," she told NBC News. "It was actually going to be a race for values as we humans go out in the solar system."
The Moon, in Melroy's framing, contains water ice at its south pole — a resource that can be converted to rocket fuel, enabling deeper space exploration. Establishing an American-led, transparency-based presence there first matters not for the optics of "planting a flag" but for setting the operational and legal norms for everything that follows.
What Happens Next
A successful Artemis II mission won't end the debates about cost, heat shields, or the right path to the Moon. But it would give NASA something it desperately needs: a working crewed lunar system, validated in flight, with human beings who came back safely.
Artemis III — the planned landing mission — was originally scheduled for 2025. It was then pushed to 2028, then redesigned entirely: it will now launch to low-Earth orbit in mid-2027 for technology tests and demonstrations before any Moon landing is attempted, according to Yahoo News. The landing itself has no firm new date.
Whether Artemis II succeeds or struggles, the program is at an inflection point. A successful mission buys political capital, validates the hardware, and gives NASA the data it needs. A failure — or even a high-profile anomaly — could give Congress the opening to dramatically restructure the program or cut it entirely in favor of commercial alternatives.
Four astronauts in quarantine are presumably not spending much time thinking about the budget numbers. They're thinking about April 1.