NASA’s competition for the development of private space stations that will take flight in the 2030s is already nearing crunch time. But a recently unsealed lawsuit may spice things up even further.

The lawsuit involves two of the most prominent companies in this competition, Houston-based Axiom Space and Long Beach, California-based Vast Space. And it is surfacing as final proposals for private space stations are due from companies to the US space agency a little more than one month from today, on December 14.

According to the court filings unsealed by a November 4 order from US District Judge Charles Eskridge, Axiom is pursuing a False Claims Act case against Vast in which Axiom accuses Vast of presenting NASA with a fraudulent mission-planning document that incorporates Axiom’s proprietary information.

“Axiom Space filed this false-claims action on behalf of the government because public-private partnerships in human spaceflight depend on candor, capability, original work, and integrity,” an Axiom Space spokesperson told Ars. “Presenting another company’s hard-won experience as its own does not meet that standard.”

In response, Vast said the lawsuit was about competition, not fraud.

“NASA opened private astronaut missions to more than one provider because competition drives innovation, delivers better value for taxpayers, and keeps America leading in space,” a Vast spokesperson said. “Misusing litigation against a competitor works against all of that.”

So what happened? Let’s unpack this further to understand what we do and don’t know at this point.

The dispute revolves around a program called Private Astronaut Missions, launched in 2019, through which NASA allows private companies to organize missions of up to four astronauts to visit the International Space Station. The missions are part of NASA’s effort to increase commercial activity in low-Earth orbit and allow private companies to gain some operational experience as they develop their own commercial space stations. As such, these missions are viewed by some as a stepping stone toward private station contracts with NASA.

Axiom became the early leader in the program, winning contracts to organize the first four private missions. The first, Axiom-1, launched in April 2022, while the most recent, Axiom-4, launched to the International Space Station in the summer of 2025. Then, in January, NASA awarded the fifth private astronaut mission to Axiom, followed by the sixth to Vast Space in February and the seventh to Voyager Technologies in April.

As part of these agreements, private companies generally purchase mission services from NASA, including food, storage, and other supplies. In return, NASA buys the capability to return scientific samples to Earth that must remain cold during transit.

The private astronaut mission agreements include contractual deliverables that providers must submit for NASA’s review. According to Axiom’s lawsuit, one such deliverable under its contracts is a Mission Integration and Operations Management Plan, or MIOMP, essentially the operational blueprint for the entire mission. Axiom alleges that Vast’s contract contains a similar requirement and that NASA’s acceptance of the document is a condition for a milestone payment.

What triggered the lawsuit?

According to the lawsuit filed by Axiom, prior to June 3, Vast submitted its mission-planning document for the private astronaut mission to NASA. Then, on June 3, NASA notified Axiom “that its sensitive information had been improperly included in a deliverable submitted by Vast.”

On page 11 of the Axiom lawsuit, the company alleges: “NASA advised that Vast’s submission in some locations substituted ‘the PAM Provider’ for Axiom’s name, while in other instances retained Axiom’s name and company details instead of replacing it with Vast’s name. That the document retained residual references to Axiom in certain sections demonstrates that the underlying text originated with Axiom and was not independently authored by Vast.”

Axiom said its mission planning documents are “sensitive and proprietary” information. These documents represent years of work and significant investment, a company spokesperson said.

“A Mission Integration and Operations Management Plan is not paperwork,” the Axiom spokesperson said. “It is the document that demonstrates to NASA the company understands and can execute every step required to keep a crew safe from launch to return. When human lives depend on a plan, the company submitting it must have developed it, understood it, and be able to stand behind it.”

What has happened since

Axiom filed a lawsuit in a Houston federal court, where the company is based, on June 19. The False Claims Act complaint seeks civil penalties, treble damages, litigation costs, and a statutory whistleblower award.

There are plenty of unanswered questions at this point. Principal among them is how Vast obtained Axiom’s planning document and how it was inserted into Vast’s submission to NASA.

What does seem notable is that Axiom sued under the False Claims Act rather than bringing a conventional trade-secret misappropriation case. The False Claims Act imposes a demanding burden of proving fraud against the government, but successful cases can produce substantial civil penalties and damages. A finding of fraud could also complicate Vast’s ability to compete for future NASA contracts, potentially including the commercial space station competition.

Additionally, by filing a False Claims Act case in federal court and essentially framing the issue as one of fraud against NASA, Axiom triggered a federal review that gave the US Department of Justice the opportunity to investigate the allegations and decide whether to take over prosecution. However, the Department of Justice declined to intervene on October 23, according to the court documents. Axiom is therefore pursuing the allegations independently.

“The Department of Justice’s decision not to intervene does not mean that what happened was acceptable,” the Axiom spokesperson told Ars.

However, Vast officials said the government’s decision not to intervene reflects the merits of the case.

“The Department of Justice reviewed Axiom’s allegations and declined to intervene,” the spokesperson said. “We think that decision speaks for itself. Axiom’s complaint does not describe a fraud on the government, and it does not meet the basic requirements of the False Claims Act.”

The Justice Department’s decision does not establish whether Vast improperly used Axiom’s materials. In False Claims Act cases, federal prosecutors may decline to intervene for a variety of reasons, including doubts about the case’s legal merits, the availability of evidence, or the potential recovery. The government provided no explanation for its decision in the court filing. Axiom remains free to pursue the lawsuit on its own.

And the company appears poised to do so. Vast said it would defend itself “vigorously” in legal proceedings. The company also said its work with NASA on the sixth Private Astronaut Mission—for which customers have already been announced—is proceeding without difficulty or interruption.

The timing is important

NASA now finds itself the central witness in a case involving two of the leading companies chasing private space station contracts that could ultimately be worth billions of dollars. Other potential contenders include Voyager, Blue Origin, and possibly SpaceX.

The agency declined to provide a substantive comment for this article. “NASA is aware of the matter but does not comment on litigation,” agency spokesman George Alderman told Ars.

The commercial space stations program, which dates back half a decade, has been a rough-and-tumble contest as private companies have jostled for favor with NASA. Ultimately, the space agency is expected to pick only a few winners to finish their space stations in low-Earth orbit and pay handsomely for NASA astronauts to visit there in the 2030s.

At times, this contest has turned personal. In September 2025, for example, far-right political activist Laura Loomer shared an in-depth post on the social media site X purporting to link Vast chief executive Max Haot, who was born in Belgium, and Vast with Chinese interests. These allegations, which raised national security concerns, were wholly unsubstantiated. A recent Washington Post investigation reported that Loomer has received payments for some political posts on X.

It is also not the only lawsuit Axiom has filed this year. In April, after policy advisor Ramzi Masri-Elyafaoui left the company to work for rival Vast, Axiom sued to stop him, alleging he violated a non-compete agreement. In June, a Houston federal judge dismissed the case with prejudice.