And it is important to understand the difference (most don't). The difference is that you can move back and forth in space (in depth, width, etc), but not in time.Time is NOT a degree of freedom. If you doubt - just write down the equation of motion in time (say, velocity or acceleration, etc) - there is NONE.

Anyone who studied physics knows that fact. This is why in SR, GR, QM, QED, field theories, etc, a time coordinate is ALWAYS separated from space coordinates by using imaginary axis. It is mathematical convinience to compactify and simplify long relationships thus to include everything in one equation.

By the way, Kyle, we studied Lorents transforms, proper length and proper time back in high school, so I know them well. You is the one to learn basic physics to see why time travel is impossible.

• Time travel? - harvey1 - October 10, 2001 - 16:54 UTC
  • No. Logical contradiction. - alexander - October 10, 2001 - 18:18 UTC
    • ??? - harvey1 - October 10, 2001 - 18:47 UTC
      • Time travel is a logical contradiction (thus impossible). - alexander - October 10, 2001 - 18:57 UTC
        • Justification is in order - harvey1 - October 10, 2001 - 19:08 UTC
          • That is, closed time curves (or CTC's) - harvey1 - October 10, 2001 - 19:27 UTC
          • The paper must have major flaw in it. - alexander - October 10, 2001 - 19:44 UTC
            • It's not a bet - harvey1 - October 10, 2001 - 19:48 UTC
              • Bending time by cosmic strings (2-D gravity). - alexander - October 10, 2001 - 20:24 UTC
                • Yes, but... - harvey1 - October 10, 2001 - 20:35 UTC
                  • Should I find out for you why this does not work too? - alexander - October 10, 2001 - 21:02 UTC
                    • Bah - stormcrow - October 10, 2001 - 21:47 UTC
                      • Hear, hear! (n/t) - luis_hamburgh - October 10, 2001 - 23:36 UTC
                      • Laws do not change. - alexander - October 11, 2001 - 20:01 UTC
                        • I'm not talking geometry - stormcrow - October 11, 2001 - 21:13 UTC
                          • But it follows from math. Math can't change. - alexander - October 11, 2001 - 23:07 UTC
                    • I can't pay much - harvey1 - October 10, 2001 - 21:53 UTC
                      • Correction: Kip Thorne (oops!) - harvey1 - October 10, 2001 - 21:59 UTC
                      • Anyone can make mistake. - alexander - October 11, 2001 - 23:41 UTC
                  • My two cents!! - doctordick - October 11, 2001 - 14:57 UTC
                    • Clarification - harvey1 - October 11, 2001 - 15:37 UTC
                      • If I can be clear. - doctordick - October 11, 2001 - 20:37 UTC
                    • Thank you....this helps me to express what I wanted to tell alex - smartguy - October 11, 2001 - 16:56 UTC