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by jonathlee 4720 days ago
It's not the speed that puts strain on the body, it's the _change_ in speed (i.e. acceleration). You are currently going ~67062 MPH around the sun and probably didn't notice. If you suddenly slowed down to 4000 MPH around the sun, you would definitely notice that. ;-). (http://curious.astro.cornell.edu/question.php?number=356)