A study from the University of Tokyo explored what happens when a paper airplane is thrown from the International Space Station (ISS).
The paper airplane was made from a standard A4 sheet of white paper, resembling a basic origami design but with aerodynamic modeling.
Simulations showed that when the paper airplane was launched from the ISS at 400 km with a speed of 7800 m/s, it descended relatively stable until reaching around 120 km altitude.
At 120 km altitude, increased air density induced uncontrollable tumbling, leading to an uncontrolled flight path similar to traditional paper airplanes. Experimental testing in a wind tunnel showed the paper airplane could withstand high winds but would eventually burn up in the atmosphere.