A Brief History of Time

First of all, fuck you Hawking.  Out of jealousy only, simply because I can't understand half the stuff you say.  I was told it would be a gentle read, but I was wrong.  It's probably me though, oh well.

Anyway, I want to know about the wormhole/time travel stuff.

1) Okay, so if I read it correctly, if someone can travel faster than the speed of light (with a spacecraft for example) they could go back in time.  I just don't get this concept.  The twin paradox for example.  How is it that Twin A can go into space at light speed while Twin B is chillin' on Earth, and when Twin A comes back, Twin B has aged more.  Now that's not time travel, but I don't get that.

2) Wormholes.  How can you travel BACK in time with a wormhole?  I thought wormholes just allowed someone to get from point A (earth) to point B (Proxima Centauri) faster. 

3) I don't understand this example, and it may tie in with one of the first two:

If it is possible for a rocket traveling below light speed to get from event A (Olympic Games 2012) to event B (opening of the 100,004th meeting at Congress of Alpha Centauri), then all observers agree A happened before B.  However, what if the space should could travel FASTER than light to carry the news of the race to the Congress.  Then observers moving at diff speeds can disagree about whether event A occurred before B and vice versa.  I simply don't understand how if someone went fast enough they could go back BEFORE the race and then know who the winner is before it happened.

1)  Traveling faster than light does not bring you back in time (relative to say, a "stationary friend").  However, there exists an observer who measures you going backwards in time (you will see him going back in time too).  That is sufficient for a breakdown of causality, and hence the statement that nothing can travel faster than light.

Twin A was accelerating, while twin B wasn't.  Since you said that  twin A was traveling at the speed of light, the proper time that passes is 0 (he does not age at all).

2)  Wormholes vary.
3)  See 1)

1. Traveling faster does not bring you back in time as thermodynamic processes will take the same amount of time. It only creates the illusion of something going back in time from observers
2. Wormholes are actually a tear in space time so it will lead to any other tear in any other spacetime. While it is possible to travel to the past it is also possible to travel to the future.
3. I don't understand this question please rephrase.

Yeah sorry about question three, I didn't feel like typing up everything he said in the book.  Thanks though =D

The speed of light is the limiting speed of information transfer.
All (well, not all, but it's just easier if we say all right now) particles are information. In fact, everything that can possibly interact with something else is fundamentally just information?
For example, what exactly is the magnetic field exerted by a particle on its surrounding environment composed of? It's just information, essentially of the particle's potential whereabouts.
So if the particle moved, does the magnetic field around it move along with the particle instantaneously?
No, the displacement of its magnetic field occurs at the speed of light, which just happens to be, in our reality, the limiting speed of information transfer.
So, if one could move faster than information itself, you would arrive at your destination before information of your arrival at your destination existed in the universe, this has relatively crazy implications. You can exist in a place before you existed in that place.
That being said, theoretically there exist particles that do not constitute information and particles that move faster than light, and this logic breaks down at the quantum level.