Frank Culbertson orbited 250 kilometers above Earth aboard the International Space Station when American Airlines Flight 11 struck the North Tower of the World Trade Center on September 11, 2001. The commander of Expedition 3 possessed a vantage point few humans have ever occupied: a perspective from which national borders dissolve and human tragedy unfolds against the curve of the planet.
Culbertson did not witness the initial impacts. The station's orbit carried him away from North America during the attacks. But as the ISS completed its 90-minute circuit around Earth, he looked down at New York City and saw smoke rising from Manhattan. Ground controllers informed him of the catastrophe unfolding below. Video captured his reaction, a moment of shock and confusion as the reality of the attacks registered with an astronaut whose primary duty was conducting microgravity science experiments 400 kilometers overhead.
The ISS, a collaborative achievement of NASA, Roscosmos, ESA, JAXA, and CSA, orbits Earth every 92 minutes. Culbertson's position granted him views most people experience only through photographs or television. Yet the technology connecting him to the events on the ground proved crucial. NASA's Mission Control maintained constant communication with the station crew, feeding them news as it developed.
Culbertson's account from orbit provides a historically singular perspective. He described seeing the smoke columns over New York and watching news reports transmitted up from Earth. The ISS communication system allowed him to receive television signals and relay his observations back to Mission Control. His testimony represents one of humanity's rare instances of witnessing planetary-scale tragedy from space.
The attacks forced NASA to reassess security protocols at the space station. The orbiting laboratory lies above U.S. airspace, and the possibility of threats to the facility prompted new contingency procedures. Launch schedules shifted. Crewed missions operated under enhanced alert protocols in the months following September 11.
Culbertson remained on station for weeks after the attacks, continuing his scientific mission despite the weight of what he had witnessed. His crew aboard Expedition 3 stayed focused on conducting experiments in materials science, biology, and physics research that required the unique environment of microgravity. This dedication reflected a long-standing principle within NASA and space agencies worldwide: exploration and scientific work continue, even amid profound national crises.
The ISS itself was still under construction in 2001, only two years into its permanent habitation. The station represented an international effort to establish a permanent human presence in orbit, a project that transcended national boundaries. That Culbertson, an American, orbited above a tragedy that would shape American foreign policy for decades underscored the ISS's role as a platform beyond geopolitical divides.
Twenty-five years have passed since Culbertson observed the smoke from space. The ISS has hosted more than 250 people from 20 countries. Scientific discoveries made aboard the station have advanced medicine, materials science, and Earth observation. Yet Culbertson's September 11 account remains a powerful reminder of Earth's fragility, witnessed from the only human-occupied outpost above its atmosphere.