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I think the differentiator is "powered flight". The ISS relies on momentum and gravitational pull to sustain that speed. Similar with the Apollo 13 CM which re

I think the differentiator is "powered flight". The ISS relies on momentum and gravitational pull to sustain that speed. Similar with the Apollo 13 CM which reached something like 36,000 MPH on the return leg, giving the astronauts on board the moniker as the fastest that humans have ever travelled in a man made vessel - not considered a speed record per se because it wasn't using an internal power source to propel (to a major extent). The X-15 still had to deal with the other aspects of atmospheric flight like weight (carrying its own fuel source), drag and heating due to friction etc.

Svoka 7y ago
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.