Our spacecraft is passing the Earth at a speed of 0.9c. Then after traveling for 10 years, we make a U-turn and return to Earth, traveling at the same speed as the Earth. The return trip takes 10 years. How long does our total journey take for an observer who measures time on Earth? (We consider negligible the phenomena that occur due to accelerations due to reversal)

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Q: The distance from earth to the center of our galaxy is about 33,000 ly (1 ly = 1 light year = 9.47 x…

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A: mass of spaceship (m) = 3.2×109 kg Length measured onboard (Lo) = 680 m Length measured by…

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Q: The distance from earth to the center of our galaxy is about 33,000 ly (1 ly = 1 light year = 9.47 x…

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.