Butterfly Metamorphosis in Space: China’s Ecosystem Experiment on Tiangong Station

On December 13, 2025, a Kuaizhou-11 Y8 carrier rocket launched from the Jiuquan Satellite Launch Center in northwestern China, carrying an unusual biological payload: a butterfly chrysalis, poised for a remarkable transformation. Weeks later, images transmitted from orbit confirmed the successful completion of that transformation. The butterfly emerged from its chrysalis aboard China’s Tiangong space station, unfolded its wings, and adapted to the challenges of microgravity.

The experiment, conducted by a team at Chongqing University in China, involved a self-contained “space ecosystem payload” named ShennongKaiwu 2. This 8.3-kilogram module, measuring 14.2 liters in volume, was designed to replicate the basic ecological cycles found on Earth, and to test the feasibility of sustaining complex life support systems in orbit. The goal wasn’t simply to observe a butterfly in space, but to determine if a closed-loop system could maintain stability long enough to support the complete metamorphosis of a complex organism.

Building Ecosystems for Spaceflight

ShennongKaiwu 2 functioned as a miniature, self-regulating environment. Plants, including chile pepper varieties, were included to generate oxygen and potentially provide nourishment. Microorganisms were incorporated to process biological waste and stabilize the atmospheric composition within the sealed chamber. Sensors continuously monitored critical parameters like oxygen and carbon dioxide levels, pressure, humidity, and temperature. The chamber was maintained at approximately 30°C (86°F) to facilitate the pupa’s development.

Professor Xie Gengxin, director of Chongqing University’s Space Science and Technology Research Institute and chief designer of the payload, noted a surprising outcome. “Many people thought the butterfly wouldn’t be able to fly in microgravity, but what we observed was that it quickly adapted to the new environment,” he said. This observation challenges a common assumption about the limitations of insect flight in the absence of gravity.

The experiment wasn’t without its challenges. Microgravity introduces a range of physical alterations that impact living systems, including changes in body-fluid distribution, disruptions in material transport, and increased exposure to radiation. Maintaining stable conditions for air, moisture, and nutrient movement also proved complex. Engineers also addressed structural concerns, specifically preventing oxidation and corrosion in the magnesium-alloy components of the sealed capsule due to high humidity – a problem that had previously limited the operational lifespan of similar habitats.

Notably, the experiment was conducted without radiation shielding, active temperature control beyond basic heating, or full-spectrum lighting. Qiu Dan, deputy chief designer of the payload and head of its biological system, emphasized the autonomous nature of the experiment. “The transformation process was entirely unmanned, unlike previous experiments (of other countries) aboard the International Space Station,” she said.

Preparing for Deep Space

The butterfly experiment represents a step towards developing self-sustaining ecosystems for long-duration space missions. Space agencies have long studied plants and microbes for their ability to remove carbon dioxide, generate oxygen, and recycle water for astronauts. The current experiment extends this research by examining the feasibility of complete organismal development in microgravity.

China has been steadily building experience in this area. In 2024, zebrafish survived 43 days aboard the Tiangong space station within a closed aquatic ecosystem. More recently, four laboratory mice were sent into orbit, with two subsequently giving birth on Earth – marking China’s first spaceflight study examining mammalian reproduction after orbital exposure. These experiments demonstrate a growing commitment to understanding how complex life can be sustained in space.

“The successful emergence of the butterfly is not just about having an insect in space,” Xie said. “It marks a solid step forward in verifying the feasibility of long-term operation of complex life support systems in orbit.”

Xie’s previous work also provides context for this experiment. In 2019, he served as chief designer on an experiment where a cotton seed briefly germinated inside a sealed biosphere carried by China’s Chang’e 4 mission. This history demonstrates a consistent focus on testing the limits of life support in extreme environments.

Looking ahead, Xie envisions a future where ecosystems accompany astronauts on deep-space missions. “True ‘space farming’ aims to utilize space resources for agricultural production,” he said, suggesting that insects like butterflies could play a role in pollinating plants in space-based farms. “Lunar and Martian farms will become a reality in the future,” he added, highlighting the long-term potential of this research.