|
I was having a read of Stephen Hawking the other day coincidentally enough.... and from what I gathered he suggested lots of ways that you could theoretically travel back in time, but all of which were fundamnetally impossible, requiring for example more energy then was in the universe to achieve it, or manouvering black holes and other theoretical white holes (which i've not seen any evidence that they exist)...
On the realities of time travel however, according to most physical laws, theoretically the universe could run backwards in time with no real change, so theoretically it is possible.
The method involving faster than light travel, well i don't think that could be achieved as to achieve faster than light speed in standard physics you require an infinite amount of mass and energy, which is clearly impossible, but with ever increasing technological knowledge it is possible we could circumvent that, or in fact find that our current models of the universe are incorrect and faster than light speed doesn't require infinite amounts of energy.
Anyway i'm generally of the opinion that we will never travel back in time, we will never go back into the past, however I think that there is a possibility that we will one day be able to create a machine which will allow timetravel back to the point at which the time machine was created, as many of the more feasible timemachines I have seen proposed all allow travellers to travel to the time when the machine was in existence but not before this, which cunningly avoids paradoxes such as the absence of timetravelling tourists.
Personally however I find time travelling to the future to be a much more attractive proposal than travelling to the past but that's just me...
<Crazy Penguin: Ponders on timetravel>
|