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[andy1005]

There are no time travellers so this makes me think that the world will end within the next millenium because time travel would be very likely invented by then and we would see people from that time and age in our periods of time.

It is likely that we will be annhiliated from the Earth within that time frame, therefore technology has not been able to progress that far.

[Twiggie]

... or time travel is impossible.

good argument thar.

[Cthulhu]

This isn't proof of anything.

[Rooster]

Time travel is possible.
There simply isn't enough energy and room for the device in the whole universe!

There. A compromise.

[umiman]

In the space of one hundred and seventy-six years the Lower Mississippi has shortened itself two hundred and forty-two miles. That is an average of a trifle over one mile and a third per year. Therefore, any calm person, who is not blind or idiotic, can see that in the Old Oolitic Silurian Period, just a million years ago next November, the Lower Mississippi River was upwards of one million three hundred thousand miles long, and stuck out over the Gulf of Mexico like a fishing-rod. And by the same token any person can see that seven hundred and forty-two years from now the Lower Mississippi will be only a mile and three-quarters long, and Cairo and New Orleans will have joined their streets together, and be plodding comfortably along under a single mayor and a mutual board of aldermen. There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.

- Mark Twain

[Jude]

I haven't seen a unicorn therefore the world will end in 20 years because otherwise they would have invented unicorns and unicorns travel backward in time

[Duke 2.0]

There are no time travellers so this makes me think that the world will end within the next millenium because time travel would be very likely invented by then and we would see people from that time and age in our periods of time.

It is likely that we will be annhiliated from the Earth within that time frame, therefore technology has not been able to progress that far.

Partially the reason people didn't think we would survive past 2000.

 And the second bold seems rather unbased as well. Unless you know something we don't.

[Errol]

I'm fairly sure that changing the past is impossible.

[penguinofhonor]

I believe in time travel, but only into the future.

[Realmfighter]

Come!

Come into my time traveling kayak!

Together, we will go to the future!

[andy1005]

My logic is based upon the last 100 years of discovery... Around 120 years ago, we were just discovering Penicillin and now we have vast quantities of many types of anti-biotics and vaccines... 120 years ago we were just experimenting with telephones and now we have mobile radiation emitters with us wherever we travel. So then you think... If we did this in around 100 years... What will our technology be like in 500 years time as our scientific community experiments further and further... Such as the experiment on creating a black hole within a confined space.

However there are many potential threats to Earth and with technology advancing at a century by century pace, we may be extinct before we reach our ultimate scientific goals. Therefore I put it out to you that 500 years is all humankind has left on this Earth - Maximum.

[Duke 2.0]

 But so far 500 is still just a random guess.

[Chutney]

Well there is this law/theorem/whatever I forget the name of, which basically states as technology gets more and more complex, each iteration of it takes ~2x as long to get to. Like, say we can use black holes to travel from Earth to the Moon instantly, and it takes us 50 years. In order to use it to travel twice that distance, it will take ~100 years, etc etc. Then we can use it to manipulate time (if possible) probably well into the 1000 years mark.

edit: especially considering we currently have no basis for such technology. If time travel IS possible, we won't see it for a loooong time, I'm willing to bet. And even if we do, what if we discover some reason not to use it?
Let's just say I wouldn't be putting any bets on this if I were you

[Angellus]

Time travel will never be possible, even if you don't think about science.

IF time travel is ever invented, some dick will always go back in time at one point and shoot/kill the person who invented the damned thing. Therefore a time machine that allows travel backwards in time is not viable, even in inmagination!

------

I abide the scientific way btw.

@Chutney, can you supply more information on that? I'm curious.

[ctharvey]

This: http://en.wikipedia.org/wiki/Moore's_law could loosely be related...