Chinese Space Agency Tests Artificial Human Embryos on Tiangong to Probe Space Reproduction

On 10 May 2024, China’s Tianzhou-10 cargo ship delivered artificial human embryos—derived from living stem cells—to the Tiangong space station. The embryos spent about five days in low-Earth orbit before being frozen and returned to Earth, where identical ground controls were cultured in parallel.

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Human settlement of the Moon and Mars requires viable reproduction in space. Prior studies indicate that microgravity and cosmic radiation can damage gametes and disrupt embryonic development, leaving a critical knowledge gap that this experiment seeks to fill.

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The project is led by Yu Leqian of the Chinese Academy of Sciences, which coordinated the design, fabrication, and on-orbit handling of the embryo models.

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The embryos launched on 10 May, experienced five days of microgravity, were cryopreserved on 15 May, and returned to Earth for analysis.

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Two model types were used: one cultured on uterine cells to mimic implantation, and another in a microfluidic chip that simulates gastrulation. Each embryo occupied an individual chamber and developed for five days before freezing.

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The five-day period corresponds to roughly 14–21 days post-fertilization, a stage when organ primordia form. Comparing space-exposed embryos with ground controls may reveal microgravity-specific influences on early development, informing safety protocols for long-duration missions.

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Yu Leqian stressed that the artificial embryos cannot develop into individuals but serve as models for early human development. He expressed hope that side-by-side analysis will identify environmental factors affecting embryogenesis and help mitigate reproductive risks for future space habitation.

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Existing research suggests that space radiation and microgravity can damage reproductive cells and interfere with embryonic development, indicating potential reproductive risks for humans in space.

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• “The human artificial embryo is made of human stem cells as raw materials,” — Yu Leqian, Project Leader, Chinese Academy of Sciences

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• “This is not a real human embryo and does not have the ability to develop into an individual. However, it can serve as a model for studying early human development.” — Yu Leqian

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• “We hope that by comparing the development of space and ground samples, we can identify the factors affecting early human embryonic growth in the space environment, and address the risks and challenges humans may face during long-term space habitation,” — Yu Leqian

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• “The artificial embryos include two types of models that represent different phases of embryonic development.” — Article text

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The frozen embryos will be returned to Earth for detailed laboratory analysis, where researchers will compare their development with the ground-based controls.

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