At a speed of 0.90c, a spaceship travels to a star that is 9.0 ly distant.a. According to a scientist on earth, how long does the trip take?b. According to a scientist on the spaceship, how long does the trip take?c. According to the scientist on the spaceship, what is the distance traveled during the trip?d. At what speed do observers on the spaceship see the star approaching them?

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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.