What is the FCC Part 97 definition of a space station?

The FCC Part 97 rules define a "space station" strictly by its physical altitude. Specifically, it is any amateur station located more than 50 kilometers (approximately 31 miles) above the Earth's surface. This definition applies to any amateur radio equipment operating at that altitude, whether it is a small, unmanned CubeSat or a fully manned facility like the International Space Station (ISS). Special rules govern space stations, dictating specific frequency bands and operational guidelines to prevent widespread interference. Distractors that suggest a space station must be manned or refer to an Earth-based station using a satellite are incorrect. An Earth-bound station communicating through a satellite is officially defined as an "Earth station," not a space station.