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US military wants to grow giant biological structures in space

DARPA scientists are exploring ways to grow massive biological objects, such as telescope antennas or huge nets to snag debris, in space

By Jeremy Hsu

3 March 2025

91av. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

DARPA envisions growing structures hundreds of metres long

Science Photo Library / Alamy Stock Photo

The US military is brainstorming ways to build large structures in space, from telescope antennas to elevator tethers. By growing these objects in microgravity using biological organisms, they hope to avoid the costly and painstaking process of launching components from Earth.

“We have yet to unlock the potential of biology for space production and manufacturing,” says , program manager for the US Defense Advanced Research Projects Agency (DARPA). The combination of biology and mechanical engineering could unlock new ways to “manufacture at unprecedented…

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