ISS does not relies on anything to sustain its speed, this is not how speed works. But again, I wrote rather short comment, and part of it was: > There are hu

ISS does not relies on anything to sustain its speed, this is not how speed works. But again, I wrote rather short comment, and part of it was: > There are humans there, they got up to speed and regularly come back To put it in other words, to get to ISS, crew has to accelerate to it's speed, and to get back, to lose it.