Growing Risks of Space Junk: China’s Astronauts Face Orbital Threats

This heading encapsulates the article’s focus on the dangers posed by space debris, particularly in the context of the recent incident involving China’s astronauts.

China’s Stranded Astronauts Show the Dangers of Space Junk

Published: November 7, 2025
Reading Time: 4 min
By: Humberto Basilio, edited by Lee Billings

This week, the China Manned Space Agency (CMSA) announced a delay in the homecoming of three astronauts due to an unexpected incident: a piece of space junk struck the Shenzhou 20 spacecraft, which was scheduled to bring them back to Earth from the Tiangong space station. While the astronauts—Wang Jie, Chen Dong, and Chen Zhongrui—are expected to return safely, this striking incident underscores the ever-growing dangers posed by orbital debris.

Understanding the Problem

Space junk consists of defunct satellites, spent rocket stages, and fragmented debris from collisions and accidents. As modern-day orbital launches have increased, so too has the volume of space junk, which poses a significant risk to active missions and infrastructure in space. According to experts, this incident is not an isolated occurrence but a harbinger of what’s to come.

“It was only a matter of time before this happened,” says research analyst Lauren Kahn from Georgetown University. Indeed, this is the first recorded event affecting a spacecraft’s return due to debris, and it raises serious questions about the safety of current and future missions.

The Rising Threat of Orbital Debris

As of April 2025, NASA reports that over 45,000 human-made objects are orbiting Earth. Among these, Kahn and her team identified 34,000 pieces of debris larger than 10 centimeters, with 73% traceable to just 20 major sources, primarily from launches by China, the U.S., and Russia. While larger objects can be tracked, the real threat often comes from smaller debris that travels at speeds exceeding 27,000 kilometers per hour.

“Those are the scary ones,” explains Jonathan McDowell, an astronomer at the Center for Astrophysics | Harvard & Smithsonian. When even a small piece strikes a vital system on a spacecraft, the results can be catastrophic.

The Kessler Syndrome Nightmare

Space scientists are particularly wary of a phenomenon known as the Kessler syndrome—where collisions between debris generate even more fragments, leading to a catastrophic cascade of impacts. With over 13,000 active satellites currently in orbit (a tenfold increase over the past decade), satellites often need to perform avoidance maneuvers, and the frequency of these maneuvers is on the rise.

McDowell suggests that if the current trajectory continues, the number of avoidance maneuvers could rise dramatically, complicating the management of orbital traffic and presenting a larger risk to future missions, particularly as plans for mega constellations of tiny satellites unfold.

Lack of Coordination and Space Cleanup Solutions

One of the pressing concerns in managing space debris is the absence of effective cleanup mechanisms. Victoria Samson from the Secure World Foundation emphasizes that international collaboration is sorely needed to address this growing threat, particularly between major spacefaring nations such as the U.S. and China.

This isn’t the first brush with danger for China’s space program. In March 2024, a fragment struck a solar panel on the Tiangong space station, creating a power loss that necessitated risky spacewalk repairs. Each incident stresses not only the risks to infrastructure but also the burgeoning number of astronauts inhabiting space.

Conclusion

As we move forward into an era where more humans are expected to travel and work in space, understanding and mitigating the risks posed by space junk is crucial. The recent plight of the Shenzhou 20 team is a wake-up call. It’s a reminder that while we reach for the stars, our past actions in orbit could have dire consequences for future missions and the safety of those who venture into the final frontier. As space continues to evolve into a crucial domain for exploration and commerce, it’s essential to prioritize the development of strategies that protect our orbital environment.