1. Sometimes the ISS has to change course in order not to collide with space debris.
2. The speed at which the ISS moves in its orbit is amazing – it is 27,700 kilometers per hour, give or take.
3. The ISS is the space station that has been visited by the most people. By the way, the world’s first space tourists flew to the ISS.
4. The ISS can be seen from the ground with the naked eye.
5. More than $150 billion has already been spent on the construction and operation of the ISS.
