For Johan lol: Physicists: Sorry, You Can't Travel Back in Time

**alphaman** · 03-12-2007, 05:41 PM

http://www.foxnews.com/story/0,2933,258279,00.html

**Dude-Man** · 03-12-2007, 05:50 PM

lol, fox news.

**alphaman** · 03-12-2007, 05:59 PM

Originally Posted by Dude-Man

lol, fox news.

What?

**Logan13** · 03-13-2007, 12:26 AM

Originally Posted by Dude-Man

lol, fox news.

It's an article from Live Science. http://www.livescience.com/

Maybe you just have a problem with science, dunno........

**tinyguy2** · 03-13-2007, 09:08 AM

i love how physicist think they know everything. Just becasue it can't be done now doesnt mean its always true. All of their theories are jsut made up in some guys head. numbers are just used to quantify things and are made up byu the human mind. All of this will get disproven one day.

**juicedOUTbrain** · 03-13-2007, 09:19 AM

Originally Posted by tinyguy2

i love how physicist think they know everything. Just becasue it can't be done now doesnt mean its always true. All of their theories are jsut made up in some guys head. numbers are just used to quantify things and are made up byu the human mind. All of this will get disproven one day.

i agree, but i think its more of a mechanism to ensure progress rather than their own egos...By focusing on things that are observable and provable, scientists can advance their knowledge...Studying things that are that far outside of our knowledge will not get us far...

That being said, theoretically, if we could travel faster than light via a wormhole or string, we could OBSERVE the past, but i dont think we could ever influence it, too many paradoxes, IMO...

**Haro3** · 03-13-2007, 09:23 AM

Originally Posted by tinyguy2

i love how physicist think they know everything. Just becasue it can't be done now doesnt mean its always true. All of their theories are jsut made up in some guys head. numbers are just used to quantify things and are made up byu the human mind. All of this will get disproven one day.

well if you think about it everything is relative...meaning the number system and everything was just made up to explain things and has just evolved over time. so in theory yes everything is made up but....NOT just physics/math is made up. its our way of explaining the way sutff happens and it works it makes sense. but! at the same time...its no more made up than religion

**Flagg** · 03-13-2007, 09:25 AM

I think I had a chat with Johan in a past forum and he already believes that time travel is impossible.

**Haro3** · 03-13-2007, 09:27 AM

Originally Posted by juicedOUTbrain

i agree, but i think its more of a mechanism to ensure progress rather than their own egos...By focusing on things that are observable and provable, scientists can advance their knowledge...Studying things that are that far outside of our knowledge will not get us far...

That being said, theoretically, if we could travel faster than light via a wormhole or string, we could OBSERVE the past, but i dont think we could ever influence it, too many paradoxes, IMO...

well i hope johan posts cuz he's mentioned the theories of relativity before which is incredibly interesting but from what i gather you can never go back in time. not like in the movies going back to 1900 etc but the closer u travelt ot he speed of light time will stand still relative to you. but relative to the earths time it has progressed many years.....now if you travel faster than light....i dont know what happens....something about pure energy and yadda yadda idont remember but if anyone has any info on this i LOVE reading about it

**Haro3** · 03-13-2007, 09:28 AM

Originally Posted by Flagg

I think I had a chat with Johan in a past forum and he already believes that time travel is impossible.

no one can say its NOT possible.....we just dont know yet....im sure it sounds just as crazy to us as going to the moon sounded to people in the late 1800's

**Flagg** · 03-13-2007, 09:41 AM

Well Haro my theory on time travel IF it's possible is this....if you can go back then change anything that could have huge changes on the future or your present then all you do is create a new timeline. The past you come from still remains unchanged, all you've done is create a new future. This would prevent paradoxes such as preventing you're own birth and so on..after all the fact you exist in the past is proof your future will happen. Does that make sense?

**Haro3** · 03-13-2007, 10:02 AM

i never said you could change the past.....and if it was possible it would cause serious problems.....i.e. the movie "butterfly effect" bad example but still a small idea of what i mean. im just saying that u cant rule out the possibility of time travel. but you cant look at it as getting in a 1980 delorian and programing in a year and going there...it wont work like that if i was to guess it would be more like i stated above where traveling and certain speeds allows time to stand still etc

**mcpeepants** · 03-13-2007, 06:18 PM

I don't see time travel as impossible. By going back in time, wouldn't you alter the past and hence create a new future. So if you killed yourself, you would create a future where you were not born but you would still exit because you came from a past where you were not killed.

**Haro3** · 03-13-2007, 10:17 PM

Originally Posted by mcpeepants

I don't see time travel as impossible. By going back in time, wouldn't you alter the past and hence create a new future. So if you killed yourself, you would create a future where you were not born but you would still exit because you came from a past where you were not killed.

lol deep! see i dont believe that going back intime is so much possible because that would occur at speeds over the speed of light which is supposedly pure energy.....but if you travel fast enough time will stand still....but i dont believe you will be able to alter the past in anyway even if it is possible

**Kärnfysikern** · 03-14-2007, 09:53 AM

Originally Posted by tinyguy2

i love how physicist think they know everything. Just becasue it can't be done now doesnt mean its always true. All of their theories are jsut made up in some guys head. numbers are just used to quantify things and are made up byu the human mind. All of this will get disproven one day.

Phycicists are more aware than anyone else that there is much more to find.
But mark my word no major theory will ever be disproven. Your claim that theories are just figments of someones mind just shows you suffer from severe ignorance regarding science.

You have to understand that all theories are valid under certain circumstances. Newtonian mechanics for instance is valid aslong as speeds are much smaller than the speed of light. Special relativity is valid aslong as we are not to close to supermassive objects, general relativity is valid aslong as we dont deal with extremely small and at the same time extremely massive objects and so on. We will find new theories that fill in the blanks for the circumstances where our current theories break down. But that does not mean our current theories are wrong.

The theories we have now explain the world perfectly all the way to the most extreme conditions we have been able to create so far at the biggest particle accelerators.

Remember that every theory we have has been put to the test billions of times and passed all those test. Saying a theory will be proven wrong is like saying that all of a sudden things will start to fall up into the sky instead of down to the ground.

Originally Posted by Flagg

I think I had a chat with Johan in a past forum and he already believes that time travel is impossible.

Yupp. To many paradoxes for me to think its possible. But until we have a working theory of quantum gravity then who can say for sure. My argument against time travel is simply that if it was possible then we would have billions of time travelers around us constantly. Because there would be a infinite ammount of time travelers traveling around.

Originally Posted by Haro3

well i hope johan posts cuz he's mentioned the theories of relativity before which is incredibly interesting but from what i gather you can never go back in time. not like in the movies going back to 1900 etc but the closer u travelt ot he speed of light time will stand still relative to you. but relative to the earths time it has progressed many years.....now if you travel faster than light....i dont know what happens....something about pure energy and yadda yadda idont remember but if anyone has any info on this i LOVE reading about it

Its often said that traveling faster than light means going back in time, but that is a missconception in my eyes. Speeds faster than light leads to imaginary time intervalls(square root of a negative number). Imaginary numbers has no physical meaning. How much time is the square root of -100? So nobody can realy talk about what happens if you go faster than light it makes no sense.

The only plausible way to get from point a to point b faster than light is to take a shortcut through a wormhole or through bending spacetime in some wierd fashion. But then you are not realy traveling faster than light you are just taking a shorther path.

**Kärnfysikern** · 03-14-2007, 10:06 AM

Originally Posted by Haro3

well if you think about it everything is relative...meaning the number system and everything was just made up to explain things and has just evolved over time. so in theory yes everything is made up but....NOT just physics/math is made up. its our way of explaining the way sutff happens and it works it makes sense. but! at the same time...its no more made up than religion

But all the scientific theories are completely independent of what number system you use. Using meter for lengt, seconds for time and kilogram for mass is a completely arbitrary chooise. You might choose any other system of units if you want to.

We can say that the scientific theories are made up yes. But when nature follows those theories to the highest accuracy we can possibly measure then it becomes a mute point.

**Haro3** · 03-14-2007, 10:16 AM

Originally Posted by Kärnfysikern

But all the scientific theories are completely independent of what number system you use. Using meter for lengt, seconds for time and kilogram for mass is a completely arbitrary chooise. You might choose any other system of units if you want to.

We can say that the scientific theories are made up yes. But when nature follows those theories to the highest accuracy we can possibly measure then it becomes a mute point.

i agree 100%

**singern** · 03-14-2007, 10:32 AM

When man was learning to harness wind to fill his sails, the idea of traveling under the ocean was a flight of fancy.
When man learned to generate electricity, the idea of harnessing Nuclear energy was science fiction with no possible form of reality.
When man flew the first airplane at Kitty Hawk, the idea of travel to another planet was considered physically imposable.

The ideas of time travel and light speed are just ideas waiting for a new, unknown, and not yet conceived form of science. We cannot base the possibility of them using known science, physics, or technology, it just doesnt make sense.

This is my sincere belief.