Not using acceleration

[kwccoin]

What if the twin brother just pass the clock image to a guy who always fly towards the earth brother. There is no acceleration of the twin rocket brother
Just info passing.

For acceleration, it will kill him anyway and in fact if one use acceleration same issue in the origin better just a guy pass thru the origin and get a clock image.

In fact have the coloured clock image of each other it would be a more interesting of these 3 crossing astronauts and involve colour Doppler effect plus this confusing time change.

[kwccoin]

[kwccoin]

3 astronauts and sync clock to the lower coloured one. No acceleration.

Question 1: what are the clock signal when red met blue.

Question 2: Not easy to do if they keep on sending their coloured clock signal after encounter and clock sync. But it is interesting and is the usual argument using Doppler effect.