"The future ain't what it used to be."

# Point A to Point B

#### Ploegman

##### Temporal Novice
I am trying to grasp the concept of time travel right now. And I am wondering something. If POINT A is at the beginning of a straight line, and POINT B is at the end of that line, and POINT A represents 12:00pm and POINT B represents 4:00pm, the time a basketball game starts in Madison Square Garden. If a wormhole looped the beginning and the end of that line, and you were able to go from POINT A to POINT B in a shorter time then the four hour spread, then when you go to the basketball game, would it have started or not?

Ploegman,

Look at the situation as occuring in two inertial frames - your frame and the frame for the other fans at the Garden who didn't encounter the WH.

You travel from A' directly B' via the WH. You miss the entire game arriving only at the 4th period horn.

The other fans travel along the entire length of A to B. They see the entire game.

Did the game start? Yes - but only for the fans traveling along A to B. For you - you can only assume that it started at A' because you were there to view the end at B'. You won't have any direct evidence to prove it, however, because you were not part of the A-B frame at all.

You should pick up a reprint copy of Einstein's 1955 book "Relativity - The Special and General Theories." Border's carries it in stock. It's easy reading, the math is straight algebra rather than calculus and Einstein was actually a rather gifted writer. It gives a very good explanation of STR and GRT that even an average high school student should be able to uderstand.

You should come away, after reading the Special Theory, with a good understanding of inertial frames of reference and how "simultaneous" is defined in STR.

Thanks a lot, I am going to order the book right now.

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