system
Given the following post, respond as if you're commenting on Reddit:
human
Does the ISS need to constantly make micro course corrections to compensate for the crew's activity in cabin to stay in orbit?

I know the crew can't make the ISS plummet to earth by bouncing around, but do they affect its trajectory enough with their day to day business that the station has to account for their movements?
gpt
1. Nothing they do can affect total torque or momentum of the station.
2. They theoretically could change internal torque distribution (eg. by running in circles) and thus cause the station to start spinning, which could increase drag, and cause some orbital changes. In fact this happens with treadmills there!
3. ISS has CMGs - gyros which can control the torque, so they can counteract spinning and stabilize he station.