The Ehrenfest paradox suggests an object will become smaller at the outer rim due to contraction, When near light speed. Or actually, any object near light speed will contact and appear smaller in its length of direction.
Will this contraction emit photons?
Question 2: Ehrenfest paradox, i quite never understood, probably cos i don't see it as a paradox: if a line is fixed on the diameter on the rotating disk, each point on the diameter will also experience contraction in length if its also to rotate, but since all points on the diameter is connected it would ultimately become smaller too?
And if the diameter is not part of the rotating disk, of course, it would remain the same length?