A spacecraft starts from earth moving at constant speed to planet A which is 20 light-hour away from Earth.
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It takes 25 hour (according to an earth observer) for a spacecraft to reach this planet. Assuming that clocks are synchronized at the beginning of the journey, compare the time elapsed in the spacecraft frame for this one-way journey with the time elapsed as measured by an earth-based clock?
Posted by Mona
Image may be NSFW.
Clik here to view.
Clik here to view.
