• If time varies depending on your velocity then how can we accurately measure distance?

    We have seen direct evidence when astronauts return from space that their time has passed differently than our own on earth. So when we consider a star is 7 light years from earth and that light took 7 years for us to see the light itself is not 7 years in its own existence. This seems to conflict with e=mc2 considering that c is measured in m/s,... show more
    We have seen direct evidence when astronauts return from space that their time has passed differently than our own on earth. So when we consider a star is 7 light years from earth and that light took 7 years for us to see the light itself is not 7 years in its own existence. This seems to conflict with e=mc2 considering that c is measured in m/s, but we already know s can vary depending what velocity you are traveling at when you are measuring what a second is. Also if we look at the speed barrier as the speed of light maybe i could see objects break that speed barrier since I am basing speed on my time and not the time the moving object is experiencing.
    2 answers · Physics · 6 years ago