Key Takeaways
1. The ISS orbits Earth at about 250 miles high and travels at approximately 17,500 miles per hour, completing a full orbit every 90 minutes.
2. Researchers from the University of Tokyo studied the effects of tossing a paper airplane from the ISS using simulations and hypersonic wind tunnel tests.
3. The study focused on flight stability, heat resistance, and potential uses for space missions, such as biodegradable braking sails and atmospheric measurement tools.
4. A 1:3 scale model of the paper airplane was tested, showing it remained stable until reaching 75 miles altitude, where it began to char and ultimately burned up during re-entry.
5. Future applications include using lightweight origami structures as eco-friendly alternatives in space missions, such as biodegradable sails for satellites and educational tools.
The International Space Station (ISS) orbits our planet at an altitude near 250 miles, zipping along at approximately 17,500 miles per hour. In its low Earth orbit, it makes a complete trip around Earth roughly every 90 minutes. So, what would occur if someone tossed a paper airplane from the ISS? To explore this question, researchers Maximilien Berthet and Kojiro Suzuki from the University of Tokyo conducted simulations and hypersonic wind tunnel tests instead of launching a real plane. Their results were published on July 3, 2025, in Acta Astronautica.
Research Findings
The study not only examined how stable a flight could be and how well the paper could resist heat but also looked into possible uses for space missions, like biodegradable braking sails and tools for studying the atmosphere. A key component of the research was a simulator that combined orbit, attitude, and aerodynamics to model the entire flight path, from the moment of release to when the airplane would re-enter the atmosphere. This simulation took into consideration factors like Earth’s gravity, air resistance, rotation, and heat build-up during descent.
Experimentation and Results
To confirm their findings, the team created a smaller version (1:3 scale) of the paper airplane, which had a paper nose and an aluminum tail, and tested it in a hypersonic wind tunnel at Mach 7, where the temperatures soared to about 650 Kelvin (around 801°F). The results showed that the paper airplane started off stable, matching the ISS’s speed of 17,500 mph. It only began to tumble when it reached an altitude of around 75 miles above Earth. At that height, the nose and wing edges began to char, although they didn’t completely disintegrate. The nose tip bent significantly yet somewhat returned to its original form. Unfortunately, the airplane never landed on Earth as it burned up between 56 and 68 miles due to the extreme heat during re-entry. What might seem like a fun experiment has actually provided valuable insights for future space missions.
Future Applications
The authors envision ultra-light origami structures made from paper as a greener alternative compared to standard materials like Mylar or Kapton. Ideas such as biodegradable braking sails for small satellites or lightweight equipment for measuring upper atmosphere air density could become feasible. These paper-based instruments might act as low-cost carriers for thin-film technologies or as interesting educational resources. Although paper includes mineral fillers like kaolin along with cellulose, which impacts its environmental footprint, the basic idea is intriguing: it’s possible to construct simple, stable structures capable of enduring atmospheric re-entry, albeit for a limited period.
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