How is it the ISS can travel at 17,400 MPH, but astronauts seem unaffected at all?

Question

EDIT: Thank you all for your kind yet informative responses!

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Answer 1

The same way you can travel in a car at 60 MPH and more without being affected at all. Or travel at hundreds of miles an hour in an airplane. Or feel like you’re perfectly still when you’re traveling at a thousand miles per hour because of the Earth’s spin. You only feel acceleration, not speed.