US scientists find ‘critical gaps’ holding back Nasa moon plan as China races ahead
American pursuit of long-term human missions to the moon hampered by budget cuts to bioregenerative technologies, paper says
Scientists have found critical gaps in Nasa’s development of space life support systems that could prevent the United States from competing with China in the pursuit of long-term manned space exploration and habitation.
While Beijing and Moscow have joined forces to establish a lunar research base, Washington’s limited support for bioregenerative life support research puts its space competitiveness at risk, a team of scientists including Nasa researchers has found.
The team said that past research and policy decisions – such as funding and programme cuts – had created “critical gaps” in Nasa’s current space habitation capabilities.
“Now on the verge of returning to the moon, Nasa needs to develop the critical capabilities required to build and operate a lunar outpost,” the team said in a paper published in the peer-reviewed journal npj Microgravity on August 16.
The paper was written by researchers from Purdue University, Northeastern University, Utah State University, the University of Utah, and Nasa’s Kennedy Space Centre and Ames Research Centre.
The existing approach to space life support systems in the US, including for the International Space Station (ISS), involves resupply trips to transport water, food and other consumable materials.
Long-term human missions past Earth’s orbit to the moon or Mars are limited by the massive costs and logistics issues associated with resupply launches, along with safety concerns about the impact of radiation and microgravity on the human body, the team said.
“If we were to execute a Mars mission right now, we would be facing many unknowns,” said D. Marshall Porterfield, corresponding author of the paper and a professor of agricultural and biological engineering at Purdue.
“The most significant of it is what’s going to happen to the human body in that radiation environment,” said Porterfield, who from 2012 to 2016 served as division director for space life and physical sciences at Nasa headquarters, where he oversaw the development of science for future human exploration.
Bioregenerative life support systems (BLSS) – or artificial ecosystems that leverage biological organisms to recycle and generate resources like oxygen, food and water – offer a better solution for long-term human missions in deep space.
These systems, also referred to as BLiSS, use plants, animals and microorganisms to create a sustainable, closed-loop environment that can provide essential survival needs such as food and waste management.
“The lack of availability of BLiSS technologies and systems – both at the governmental and commercial levels – currently limits the objectives of human-crewed lunar exploration programmes,” the team wrote.
Porterfield said that the US had the “completely wrong model for how we need to go to space”, with a focus on being a logistics transporter rather than a logistics provider.
A bioregenerative approach was the focus of earlier Nasa research, including the development of sustainable agricultural systems for space exploration in the 1990s, which helped to birth the controlled environment agriculture industry.
That next phase for Nasa was the Bioregenerative Planetary Life Support Systems Test Complex (BIO-Plex), a facility which aimed to evaluate life support systems that could supply food, water and a breathable atmosphere for future space missions.
In 2004, it was discontinued and physically demolished after a large-scale study led to budget cuts and a shift in research priorities, the team said.
“The budgets for Nasa to develop these bioregenerative technologies were cut and never restored,” Porterfield said.
Remaining bioregenerative technologies research is now facing further funding cuts under the Trump administration’s 2026 budget, he added.
While US support for bioregenerative life support research waned after the early 2000s, the team said that this research had been “embraced and advanced” by the China National Space Administration (CNSA) over the past two decades.
The team said that published BIO-Plex plans “supported CNSA’s efforts to swiftly establish a bioregenerative habitat technology programme for an operational human lunar outpost and, subsequently, to demonstrate its viability”.
The Lunar Palace 1 at Beihang University in Beijing is China’s first integrated experimental facility for a permanent artificial closed ecosystem life support system, which includes cabins for vegetation, facilities for waste disposal, dining and bedrooms, according to the university.
“Besides the Chinese efforts, there are currently no other official programmes pursuing a fully integrated, closed-loop bioregenerative architecture for establishing lunar or Martian habitats, or even for sustaining long-term human presence in space,” the researchers said.
They added that recently published plans from CNSA showed that the country “has surpassed the US and its allies in both scale and preeminence of these emerging efforts and technologies, especially as compared to Nasa’s current programmes”.
The US government invested heavily in science and technology programmes during the space race with the former Soviet Union, including the creation of Nasa.
But the tensions of the Cold War did not stop scientific cooperation in space between the two, which eventually led to the ISS programme that included the US, the Soviet Union – later Russia, Europe, Japan and other partners.
This changed in 2014 after Russia annexed Crimea, which spelled the end of decades of successful cooperation.
The only remaining joint space programme between the two countries involves fulfilling their obligations to the ISS, which is scheduled for decommissioning in 2030.
In 2011, the US Congress passed the Wolf Amendment, which prohibits Nasa from using government funds to cooperate with CNSA and China without congressional approval.