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A space 100m long space ship travels to planet X which is a distanace of 6E11m from Earth. It travels at 90% of the speed of light. Who measures proper time for the journey?



A. Observer on the earth
B. Pilot of space ship
C. Another independent observer
D. The cosmic time keeper

This question is part of H3 Time dilation, length contraction
Asked by Gboulton, Last updated: Apr 19, 2018

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1 Answer

gboulton

Gboulton

Answered on Oct 27, 2017

Pilot of space ship

Must be the pilot of the space ship since the start and the finish of the journey to him occur at the same place (where he is)
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