Thanks ... But I would have thought that relative to the twin in the rocket cockpit, the earth did all of the acceleration and deceleration ... I'll look into your idea re: GR and figure this out.  Thanks again!

Regarding this whole twin thought experiment.  If twin A is on Earth and twin B leaves in his rocket ship near the speed of light and leaves for a year long round trip.  It is supposed that the twin on Earth would have aged  much more that his twin on the ship, right? 

Well now lets suppose that there is another person in a stationary ship that is in a location where he can observe both Earth and the route of the moving spaceship with twin B in it.  This separate stationary person marks off on his calendar the day the spaceship left and when the spaceship arrived back on Earth, and found that the ship indeed did take one year.  So one year has passed for all involved.  Everybody is a year older.  There is no vast difference in ages because the time universally was the same everywhere.  No time warp, no slowing of time.

Any outside observer would have seen the whole thing and everything involved move at the same rate through time.  A year trip takes a year.  In reality it took a year.  When you start to get involved with what is relative to something else does not change what REALLY happened in the physical universe.  No matter the speed of a moving object, the universe sees everything age at the same rate.  This whole viewpoint thing of twin A and twin B is just  a viewpoint.  What APPEARS to be happening from the twins perspective is just their “take” on what is happening.  Not what REALLY happened.


Steve

How does a rockets motion have an influence on a persons aging process?  Both the rocket and the twin are part of the same universal time line.


Steve