Suppose that a person is 15.00 y older than their sibling. The person wants to travel outward from Earth for 2.000 y and then back for another 2.000 y (both intervals as they measure them) such that the person is then 15.00 y younger than their sibling when they return. What constant speed parameter β (relative to Earth) is required? (Ignore any effects or delays from turning around).

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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.