On November 16, 2022, NASA’s Space Launch System thundered off Pad 39B at Kennedy Space Center, generating 8.8 million pounds of thrust and sending the uncrewed Orion capsule toward the Moon. Roughly eight minutes later, the rocket’s 212-foot core stage, still warm from burning through 733,000 gallons of liquid hydrogen and oxygen, separated from the upper stage and tumbled into the Pacific Ocean. It was never meant to come back.
That single flight cost taxpayers the culmination of more than $23 billion in development spending, according to a 2023 Government Accountability Office report. Now, more than three years later, the SLS has not flown again, Artemis II has slipped repeatedly, and federal auditors continue to warn that the program’s price tag may be unsustainable. As of April 2026, the debate over whether the most expensive rocket in NASA’s history deserves its budget line has only intensified.
Built to be thrown away
The SLS is expendable by design, not by accident. NASA’s Artemis I Press Kit describes the core stage and launch vehicle stage adapter as components that follow a one-way trajectory into the ocean after separation. Each core stage carries four RS-25 engines, a massive liquid hydrogen tank, and a liquid oxygen tank. All of it sinks to the ocean floor minutes after liftoff. No recovery system was built because none was ever planned.
During Artemis I, NASA confirmed that core stage separation was completed as intended. The mission was a technical success: Orion traveled beyond the Moon and returned safely. But the flight also crystallized a financial reality that auditors had been flagging for years. Every future Artemis mission requires a brand-new SLS, built from scratch at a cost the NASA Office of Inspector General has estimated at roughly $4.1 billion per launch when production and ground systems are included.
NASA’s own leaders called it ‘unaffordable’
The sharpest criticism of SLS spending has not come from commercial rivals or congressional skeptics. It came from inside NASA itself. The GAO’s 2023 report, titled “Space Launch System: Cost Transparency Needed to Monitor Program Affordability,” revealed that senior NASA officials told auditors the SLS program is unaffordable at its current cost levels. That word, “unaffordable,” appears in the report as an on-the-record institutional admission, not outside speculation.
The same report found that NASA anchored its SLS cost and schedule baselines to the Artemis I mission, effectively tying the program’s financial benchmarks to a single completed flight. That decision left ongoing production and sustainment costs less transparent, the GAO concluded, making it harder for Congress and the public to track how much each subsequent rocket will actually cost.
NASA has not released detailed, itemized production costs for future SLS vehicles, including the upgraded Block 1B variant planned for later Artemis missions. The GAO identified this transparency gap but did not fill it with specific per-unit figures, leaving outside analysts to piece together estimates from partial budget documents and contract awards.
Schedule pressure and the Starship question
Artemis II, the first crewed SLS flight intended to carry astronauts around the Moon, has faced repeated schedule shifts. NASA had targeted late 2025 for the mission, but as of early 2026, the agency has not locked in a firm launch date backed by updated primary documentation. Each delay extends the gap between SLS flights and raises questions about production cadence and workforce retention at NASA’s Michoud Assembly Facility in New Orleans, where core stages are built.
Meanwhile, SpaceX’s Starship, a fully reusable super-heavy launch vehicle, has continued flight testing. NASA selected a Starship variant as the human landing system for Artemis III, meaning the agency is already relying on a reusable commercial vehicle for a critical piece of its own Moon program. That juxtaposition sharpens the cost debate: one part of Artemis depends on a rocket designed to fly once and sink, while another depends on a rocket designed to land and fly again.
Whether NASA has formally evaluated reusable alternatives for the SLS role remains unclear from available institutional records. The GAO critiques focus on cost visibility and schedule management rather than on engineering trade studies comparing expendable and reusable architectures. A follow-up GAO review published as report GAO-25-106943 examined Artemis ground systems and found that the Exploration Ground Systems Program could strengthen its schedule decisions, adding another layer of oversight pressure without resolving the central affordability question.
What the evidence supports, and what it does not
The strongest evidence in this debate rests on two pillars. NASA’s own mission records explicitly describe the expendable design. These are engineering plans, not interpretations. And the GAO reports carry the authority of a nonpartisan congressional watchdog with direct access to internal NASA financial data. Together, they establish that the SLS works as designed and that its cost trajectory has alarmed the people responsible for managing it.
What the evidence does not yet support is a definitive conclusion about whether SLS will be replaced, restructured, or supplemented by commercial vehicles for future Artemis missions. The GAO findings point to a program under financial stress but stop short of recommending cancellation or naming a specific alternative. No recent official NASA statement in the public record directly responds to the GAO’s unaffordability finding with a concrete plan to reduce per-launch spending.
A $4 billion question with no clear answer
The gap between what NASA built and what NASA can afford to keep building defines the tension at the center of the Artemis program. A rocket that performs exactly as engineered but cannot be reused poses a straightforward question for policymakers and taxpayers: how many times can the agency justify building, flying, and discarding a $4 billion launch vehicle? Federal auditors have flagged the problem. NASA’s own leaders have acknowledged it. The answer, as of April 2026, remains caught between the agency’s lunar ambitions and the budget realities that govern how it gets there.
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*This article was researched with the help of AI, with human editors creating the final content.
