Taking a frame attached to earth as inertial, which of the following objects cannot have inertial frames attached to them, and which are inertial reference frames? a)if an object moving in a circle with contant speed has accelerating although speed is constant, then what will its frame of reference? b)Is the atmosphere attached to earth an inertial or noninertial reference frame?  Are there any visible effects this might cause when we view it?

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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.