Psst, in a 1907 paper, Einstein admitted that the geometric shape of a body does not really “contract” due only to “relative motion”. So if we have your frame in which the two photons are emitted be about 186000 miles long, in each direction from the atom that emits the photons, the length of that frame doesn’t really “shrivel up” just because some other frame is moving relative to it.Originally posted by Tempest
Now, either the distance the atom is away from the photon in this photonic frame has been Lorentz contracted or not. Assume it has been contracted.
He said it this way:
In Lorentz’s 1904 relativity theory, his “contraction” was due to a mass moving through an ether and being contracted by that motion, by means of the mass somehow “feeling” a resistance to its motion through the ether and contracting as a result, much like if we hold a balloon inside a moving car and it has a round shape, then we hold it outside the window of the car and the air resistance changes its shape. But just “relative motion” alone, between two masses, can not cause a “length contraction” in either of the masses.Einstein said in 1907
“The shape of a body in the sense indicated we will call its ‘geometrical shape’. The latter obviously does not depend on the state of motion of a reference frame.”