Chinese scientists are raising fresh doubts about whether humans could safely have children beyond Earth. Drawing on biological research linked to China’s Tianzhou spacecraft missions since 2017, the team found that the environment in space may be far less suitable for reproduction than long-term settlement plans often assume.

The work focuses on two major hazards of space travel: microgravity and space radiation. According to the report, those conditions can disrupt biological processes in ways that may make conception, pregnancy and healthy development much harder to achieve in orbit or on deep-space journeys.

The findings add a sobering note to broader discussions about humanity’s future in space. While space agencies and researchers continue to study how people might live for extended periods away from Earth, reproduction remains one of the toughest unanswered questions.

Based on the available details, the researchers’ conclusion is clear: the outlook for having babies in space is not encouraging. The study suggests that before any serious plans for multigenerational life beyond Earth can move forward, scientists will need a much better understanding of how the space environment affects human biology.