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**Flat Earth Debate / Re: Michelson-Morley Experiment **

« **on:**July 26, 2019, 03:01:07 PM »

The link you posted says light travels at c no matter what. Why do you ignore this?If light travel parallel y axis, then it velocity along x axis is zero. It is very obvious.

Look at this picture

In primed coordinate, u_x' was stated in term of einstein velocity addition. At the numerator there is u_x + v. This is because v and u_x in opposite direction. If u_x and v in the same direction, then we substract it. So if u_x equal with v,

numerator become zero, and this means u_x' will zero whatever happen in denominator. So that means the beam of light have zero velocity component along x direction. Someone move with v = u_x only see light move downward along y axis with velocity given by u_y'.

But,

The value of u_y' = u_y / gamma (1 + u_x v / c^2)

= c sin theta / gamma (1 - c^2 cos^2 theta /c^2)

= c sin theta/ gamma (sin^2 theta)

= c /gamma (sin theta)

Because the value of gamma >= 1 then this is make u_y' always less than c.

So observer moving in x direction with v = u_x just see the light moving downward parallel y axis with speed less than c. Thus violating special relativity postulate.