(a) Imagine for a moment that the Earth hasno atmosphere. Over the period of a year, is the number of daylight hours at your home greater than, less than, or equal to thenumber of nighttime hours? (b) Repeat part (a), only this timetake into account the Earth’s atmosphere.

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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.