Who invented time travel?

[robotguy]

Originally posted by Ed Spruiell
it happened last week.

when did last week happen?

[edX]

check your calender. robots do have access to calenders don't they?

[robotguy]

i checked my calendar

i could find no entry for 'last week'

it must be relative

to a piece of information 

i do not have

[edX]

see if you've got this week. it's usually pretty close to last week so if you can find it, you'll have them both.

[robotguy]

when
>this week<
becomes
>next week<

then 
>this week<
becomes
>last week<

and
>last week<
becomes 
>this week<

<forever loop>
 
i hope you can see
my dilemma here 

is there some sort 
of resistance i should
be using 

to slow this routine down?

it currently moves so fast
i cannot tell what 
it is supposed to be
doing

[MacLuv]

Originally posted by RacerX
There are no fixed reference frames with would make time travel possible.

How about a thread in a forum? Each post is a fixed reference point. If you read this thread from beginning to end again, you'll see it is possible to travel through time. I wasn't able to change anyone else's actions, though, just my own. What does this tell us about time travel--and does it give you any clue to who invented it?

[brianleahy]

There are no fixed reference frames with would make time travel possible.

Likewise, there are no fixed reference frames for spatial travel either, yet it is possible. Years ago scientists abandoned the notion of 'absolute rest' - there is no such thing. As an object moves through space, its path is the net result of all forces acting upon it. This includes any propulsion it may be using, plus friction, gravity, and impact with other objects.

But what sorts of forces influence an object's path through time? Everything seems to be moving forward through time at roughly the same rate - but there are variances. Einstein showed (and lab experiments have proved) that an object under stronger gravity moves forward through time more slowly than an object under less gravity. He also showed that an object moving at a significant fraction of the speed of light will move forward through time more slowly.

So we know that gravity affects time velocity as well as spatial velocity. Also, a higher spatial velocity results in a lower time velocity!

If backward time travel is possible, then it seems logical that these - and perhaps other - forces would govern an object's timelike path.

-

PS: meaning no offense to anyone, although a discussion thread may be analogous to 'time travel' in some ways, it is really just a record that can be modified. Rewriting history books does not change the past, so it clearly is not time travel. If I write "Ten minutes ago I hopped into the Millenium Falcon and now I am orbiting Mars." that doesn't make it so.

[kendall]

Originally posted by MacLuv
How about a thread in a forum? Each post is a fixed reference point. If you read this thread from beginning to end again, you'll see it is possible to travel through time. I wasn't able to change anyone else's actions, though, just my own. What does this tell us about time travel--and does it give you any clue to who invented it?

This thread and forum have nothing to do with our constantly expanding universe do they? Have you confused time travel with post editing?

I can go back and change my Calculus homework after it has been graded. It wouldn't change the teachers notes, just my answers. Did I just time travel?

Needless to say, this tells me nothing about time travel. It does tell me however that you can conciously create a situation and later manipulate it in attempts to prove some point.