Originally Posted By: Lukas
@AlbertoT: If the brother that stays on Earth would transmit his own heartbeat to the brother on the ship, the brother on the ship would also think that the heartbeat of the other brother is slower than it is as measured on Earth.



Exactly, simmetry is the essence of relativity
If the doctor reaches the pilot on board then the doctor would be younger

BTW I got the inspiration for this version of the twin paradox from one of most amazing evidence of the special relativity

Remote stars travel at a speed close to the light speed
The spectrum of their light is shifted to the red to such extent that can it not be explained by the Doppler effect only
there are two alternatives :

#1 Time is absolute,
Remote stars are made of a sort of "hybernated" unknown elements
#2 Time is relative
Remote stars are made of the same elements as our sun

Of course the latter is true but also the former is consistent with the measures
It is the twin paradox




Last edited by AlbertoT; 12/18/11 12:49.