What do you think?

[Raquelio]

Well, just for fun, what are your thoughts on time travel? In general, what theory do you believe? Do you have your own? Impossible or possible? Discuss!

 

[Mello]

I don't think it's possible to travel back in time.

Time can only be slowed down or sped up.

 

[Vrecknidj]

I think a machine which allows traveling back in time is a wonderful device for fiction writers.

 

[Architect]

"Closed timelike curves" exist which are solutions to the General field equations. They've been known for some 70 years, and these space-time solutions do have a varying time axis. In short, time travel does exist in theory. Whether they actually exist in the real universe, in any useful sense is another question.

Future time travel is relatively easy, just go in the neighborhood of any heavy gravitational body - say, a black hole. Time slows down. Or travel close to the speed of light.


Personally I don't find time travel interesting anymore, other than future time travel.