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Originally Posted by Kebsis
Since the Earth and Mars orbit the sun at different rates (they do, right?) wouldn't an astronaut that goes to Mars encounter some of the strange relativistic effects of being there? Like when they got back wouldn't less time have passed for them then for us?
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Yes, they do orbit at different rates. The relativity part, there would be no noticeable difference for the astronaut. Relativisitic effects (worth mentioning anyway) are only at VERY high speeds, otherwise you would technically be aging more slowly if you were running past someone!