Of course time travel is possible: we are doing it, in the forward direction, right at this moment. :P
As far as the "grandfather paradox" goes, there are a few theories which explain how it cannot occur or is insignificant, one of which is the
multiverse theory. (extremely long article)
A quick google search should yield you many sites and articles regarding this issue.
As far as the universe being infinite, there exists a counterpoint where space is indeed infinite, but the universe is not.
Imagine a sphere: although one may travel along the surface of the sphere indefinitely without reaching an end, the sphere itself is quite finite. IIRC, it is quite possible that gravity warps 3D space into a sphere of sorts, allowing infinite space in an finite universe.
Again, you should be able to find many related articles on the web.
Age in reverse?
How do you suppose this can happen?
Once the traveller exceedes "the speed of light", the laws governing the particles which makes up his body is reversed? And, since everything is relative, wouldn't that be the same as the rest of the universe going "back in time"?
The common basic assumption is that once particles crosses the event horizon, it is essentially "lost" to the black-hole. This includes all matter and electromagnetic energy. Charged particles are matter, and hence cannot escape from the event-horizon. How can the energy of a black hole be harnessed through the means of extracting charged particles?
As far as the "grandfather paradox" goes, there are a few theories which explain how it cannot occur or is insignificant, one of which is the
multiverse theory. (extremely long article)
A quick google search should yield you many sites and articles regarding this issue.
Quote:the second, which is less commonly thought of, is that one would age backwards, meaning one wouldnât be born by the time s/he goes back that far.Oh? But that wouldn't mean only an "observer" has really travelled back in time, and the the subject has not?
As far as the universe being infinite, there exists a counterpoint where space is indeed infinite, but the universe is not.
Imagine a sphere: although one may travel along the surface of the sphere indefinitely without reaching an end, the sphere itself is quite finite. IIRC, it is quite possible that gravity warps 3D space into a sphere of sorts, allowing infinite space in an finite universe.
Again, you should be able to find many related articles on the web.
Age in reverse?
How do you suppose this can happen?
Once the traveller exceedes "the speed of light", the laws governing the particles which makes up his body is reversed? And, since everything is relative, wouldn't that be the same as the rest of the universe going "back in time"?
Quote:The rod would then be out of the event horizon from which nothing can escape, Then you could send particles from the rod with a certain charge, then others with an opposite charge in a different area, then you have a charged black hole to draw your energy from.I find this quite interesting. How would this work?
The common basic assumption is that once particles crosses the event horizon, it is essentially "lost" to the black-hole. This includes all matter and electromagnetic energy. Charged particles are matter, and hence cannot escape from the event-horizon. How can the energy of a black hole be harnessed through the means of extracting charged particles?