# Thread: Time Travel

1. That would be proportional to the amount of time between the event and the traveler's present. Going back ten years and killing a cockroach wouldn't do much, but going back ten million years and killing a cockroach would probably cause big problems.

The further in the past the change is, the greater its effect.
Well, If those ten days are ten millions years before the future, it might have as great of an effect because perhaps the cockroach you killed would've been the one that would led the insursion over the human race.

2. Originally posted by maverick

If you go through a black hole, you would be crushed to the size of a sub-atomic particle, no matter which way you go.
Not necessarily......a black hole spinning quickly enough (the Kerr solution) would be traversible along the axis of its rotation. To where, no one can say just yet.

3. Originally posted by PowerManDL

Not necessarily......a black hole spinning quickly enough (the Kerr solution) would be traversible along the axis of its rotation. To where, no one can say just yet.
I'll have to get back to you on this topic. My books are at home and I'm at work. I'm a little rusty on Astronomy.

4. Originally posted by Nights
I'm with the school of thought that, if you went back and time and changed anything the future would be completely different. Therefore, the thing that you went back to change, would no longer have existed in the future that you went back in. So, you wouldn't have gone back. So you wouldn't have changed anything, so the future would be exactly like it was before.

Oh, and I believe that time doesn't exist. Just like germs and gravity. Just enough people believe in it to make it real.
Why don't you believe in gravity? It is the attaction of 2 masses to each other. Secondly why don't you believe in "germs" aka bacteria?

5. One of the big problems of time travel is: if it were possilble, why haven't we met any time travelers?

One of the theories that addresses this question is actually a cool idea: time travel is not possible until some sort of a time machine is invented and then built. However, the machine cannot travel back in time further than to the point that the machine itself was invented. Since the machine hasn't yet been invented, we haven't yet been able to meet any time travelers.

6. Germs are bull****. I'm with you, nights.

Worms...now worms are nasty.

7. People don't believe in bacteria? wtf? that's like one of the first/basic life forms on Earth.

and gravity? How can someone refute that?

8. Originally posted by Manveet
People don't believe in bacteria? wtf? that's like one of the first/basic life forms on Earth.

and gravity? How can someone refute that?
For the gravity issue. What causes gravity? We don't know. We just know it happens.

9. It's possible to travel into the future, via space flight. When in space time slows down. Traveling partway to the center of the galaxy and back might be a few years to the space traveler, but tens of thousands of years will have passed on Earth.

Backward time travel is trickier. As for the Grandfather Paradox (you know, go back in time, kill your grandfather, how the hell are you born to travel backwards and kill your grandfather... ), the theory is that backwards time travel takes you to a parallel time. You can observe, but not affect it.

Interesting stuff... http://www.howstuffworks.com/time-travel.htm

10. Originally posted by GonePostal

For the gravity issue. What causes gravity? We don't know. We just know it happens.
Do you want the prevailing theory?

11. Your not really traveling into the future with space flight. Your reference clock is differant then reference cloack on earth. Less time has passed for the traveller, then the reference point on earth.
As far as gravity being a mystery-no, everything has a gravitional pull to it, even you, its just not enough to make a difference.
Instead of reading all these article I suggest you read a physics book and then quantum physics. Its actually pretty interesting. All your getting from alot of your sources is dumbed down scifi.

A few calc classes first.

12. Umm.......so in other words, the traveler has moved into the future relative to Earth. And, in fact, most of the solar system, which would be on a similar frame of reference.

I'm not seeing the problem.

13. I worded that wrong. Yes you could say you are time traveling. Anything that accelerates is to a degree.

14. Well......get next to a large enough source of gravity, say a black hole, and you could go quite a ways into the future.

Pretty effective means of time travel for not actually going into the future, eh?

15. Originally posted by Tryska

dork.

16. I really don't know much about black holes. Most of studies have on things down here. I suppose your going to accelaerate as you get closer, but the breaking away part.

17. Not the acceleration, man.

A black hole rips space-time to shreds around it. Gravity = acceleraton. A black hole, even outside the event horizon, would trash local space-time enough to exploit a time-dilation effect. You could move into the future, then move away.

Same really applies to a neutron star or any similarly massive object.

18. I think the thing to note in these matters of black holes and accelaeration is time is passing slower for you compared to the rest of the universe. Your not going back in time to a parrellel universe or able changing anything. Getting back is the trick.

19. Well yeah, that's the whole idea of time travel, to make time for *you* move differently than time for everyone else.

Just so happens that heavy gravity and/or acceleration slows down time for you, thus moving you into the future. Assuming that we're defining future as the subjective frame of reference of "Earth" with respect to "you."

20. I would get in on this thread, because I love this sort of stuff, but I just finished my last final exam and my head hurts too much to think.

21. I agree Powerman.

22. Originally posted by Berserker
I agree Powerman's a dork.

23. Originally posted by Berserker
I agree Tryska is a Dork.

24. Originally posted by PowermanDL

I agree berserker is a dork.

25. someone doesnt believe in gravity??

btw- after the gym i had to take a whizz.......twice!

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