Anabaena—a promising chassis for space exploration

Life Support from Simple Cells

Sending people to the Moon and Mars for long stays will demand far more than rockets and metal. Astronauts will need air to breathe, water to drink, food to eat, fuels, and building materials—ideally made on site rather than shipped from Earth at enormous cost. This review article explores how a humble photosynthetic microbe called Anabaena could become a living backbone for future space settlements, turning sunlight, carbon dioxide, and local rock into oxygen, fertilizer, and useful products.

A Hardy Microbe with Special Jobs

Anabaena is a filamentous cyanobacterium, a microscopic organism that forms chains of cells. It has three main cell types that share work. Ordinary vegetative cells capture sunlight and pull carbon dioxide from the air, releasing oxygen as they grow. Specialized cells called heterocysts create a low-oxygen pocket where nitrogen from the air is converted into forms that living things can use as fertilizer. A third type, akinetes, is a tough, dormant state that survives drying, starvation, and extreme temperatures. Together, these roles let Anabaena and its close cousin Nostoc thrive in harsh lakes, soils, and deserts on Earth, hinting that they could also cope with the rigors of space and alien landscapes.

Mining Decades of Research with Artificial Intelligence

Because thousands of studies on Anabaena exist, the authors used an artificial-intelligence pipeline called NEKO to organize this scattered knowledge. They collected about 2,000 scientific abstracts and built a “knowledge graph” in which each node represents a paper or key term and links show how topics connect. This map revealed major clusters of research: the organism’s basic biology, its stress tolerance, and its many practical uses, from agriculture and water cleanup to the emerging area of space research. By highlighting which ideas recur together—such as nitrogen fixation, biofuels, and microgravity—this network helps scientists quickly see where Anabaena is already well understood and where new space-focused experiments are still missing.

Turning Mars Resources into Air, Food, and Fuel

The review explains how Anabaena could anchor “Bio-ISRU”—biological in‑situ resource utilization—on the Moon or Mars. In this vision, transparent bioreactors filled with these microbes sit on or near local regolith (rocky soil) and bathe in sunlight. The filaments would use light to convert Martian carbon dioxide into oxygen and biomass, and pull nitrogen from the atmosphere to make natural fertilizer. Models and experiments with Martian soil simulants show that certain Anabaena strains can grow at low pressure with mostly carbon dioxide and nitrogen gas, and can extract nutrients from rock despite toxic perchlorate salts. The same biomass can feed other organisms such as crops, fish, or insects, and can be processed into fuels, biodegradable plastics, or medically active compounds—greatly reducing dependence on supply rockets from Earth.

Built‑In Toughness for Space Conditions

Laboratory and spaceflight tests suggest that Anabaena and related strains can tolerate many stresses expected beyond Earth. Under simulated microgravity, they mount a strong antioxidant response that helps them manage damaging reactive molecules. Dried Nostoc cells have survived years of exposure on the exterior of the International Space Station while enduring wide temperature swings, vacuum, and intense radiation, and have even grown for months on Mars-like soil. These studies imply that dried filaments could be shipped to space with no refrigeration, rehydrated on arrival, and still function. At the same time, the authors caution that some strains can produce toxins, so any space system must carefully screen strains, monitor for harmful molecules, and build in safeguards for workers and for closed habitats.

Designing Future Life‑Support Loops

Looking ahead, the authors outline how Anabaena could fit into closed‑loop life support systems that constantly recycle air, water, and nutrients. In one concept, an Anabaena bioreactor sits at the center: sunlight and perhaps extra simple carbon sources such as acetate feed the microbes, which supply oxygen, fertilizer, and biomass to crops and other organisms. Human waste streams and inedible plant matter circle back through digestion units, returning water and nutrients to the reactor. Computer models show how such systems might be tuned for Martian gravity, thin air, and dusty skies, and genome‑scale metabolic models help identify which Anabaena strains and growth modes (purely light‑driven or mixed with simple organic foods) would perform best under low light and limited nitrogen. The article stresses that better genetic tools, co‑culture designs, and economic analyses are still needed before such biotechnological loops can reliably support human outposts.

Why This Matters for Future Explorers

In plain terms, this review argues that a microscopic, photosynthetic “living factory” like Anabaena could one day help astronauts breathe, drink, eat, build, and even make medicines on other worlds. Its ability to capture sunlight, make its own fertilizer, survive extreme conditions, and be genetically tuned makes it a powerful candidate for space farms and bioreactors. While more testing in real space environments is essential—especially to manage toxins, radiation, and low gravity—the work summarized here shows that turning alien air and rock into human necessities using simple microbes is not science fiction but an emerging engineering challenge.

Citation: Muddana, C., Desai, G.M., Wangikar, P.P. et al. Anabaena—a promising chassis for space exploration. npj Microgravity 12, 27 (2026). https://doi.org/10.1038/s41526-026-00568-2

Keywords: Anabaena, space biomanufacturing, bioregenerative life support, in-situ resource utilization, cyanobacteria