Answers: 2
is the time measured by the observer on a fixed position (in this case in the fixed planet), 
is the time measured by the person moving away from the fixed observer (the one on an interplanetary express bus), 
is the speed of light and 
the velocity of the observer that is moving away (the velocity of the ship).
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Apassenger on an interplanetary express bus traveling at = 0.95 takes a 9.0-minute catnap, according...
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