gammaSat, Sep 26, 2009 Time travel is a common phenomenon for fast travelers whose personal clocks run slower than ours. This is the travel into the future. Gravity makes time run slower; nowadays clocks are so precise that they can detect the difference between the ground level and satellite orbits.
One solution for travel into the past is, as far as I remember, based on hypothetical object called Tippler's cylinder. It is a massive object that ought to have infinite length. Then you could spiral around and slip into the past. Other solutions are based on alternative cosmologies, such as spinning universe, bubble universes, uneven expansion, etc. Some black dude made a hypothesis for light travel into past, but he is still building a lab.
Particles don't seem to obey the concept of time based on thermodynamics, because particle reactions a+b=c+d can be executed backwards without problems c+d=a+b.
Time travel is a common phenomenon for fast travelers whose personal clocks run slower than ours. This is the travel into the future. Gravity makes time run slower; nowadays clocks are so precise that they can detect the difference between the ground level and satellite orbits.
One solution for travel into the past is, as far as I remember, based on hypothetical object called Tippler's cylinder. It is a massive object that ought to have infinite length. Then you could spiral around and slip into the past. Other solutions are based on alternative cosmologies, such as spinning universe, bubble universes, uneven expansion, etc. Some black dude made a hypothesis for light travel into past, but he is still building a lab.
Particles don't seem to obey the concept of time based on thermodynamics, because particle reactions a+b=c+d can be executed backwards without problems c+d=a+b.