Travel Faster Than Light: Going Back in Time?

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SUMMARY

The discussion centers on the theoretical implications of traveling faster than light (FTL) and its effects on time perception. Participants assert that no object with mass can exceed the speed of light, referencing established physics principles. The conversation touches on concepts like redshift and tachyons, while emphasizing that imagining FTL travel leads to paradoxes and speculative scenarios. Ultimately, the consensus is that FTL travel remains a theoretical concept without practical application in current physics.

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  • Understanding of Einstein's theory of relativity
  • Familiarity with the concept of redshift in astrophysics
  • Basic knowledge of tachyons and their theoretical implications
  • Awareness of the limitations of mass and speed in physics
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  • Research Einstein's theory of relativity and its implications on mass and speed
  • Explore the concept of redshift and its significance in astronomy
  • Investigate the theoretical properties of tachyons and their role in physics
  • Examine the philosophical implications of faster-than-light travel and time perception
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Physicists, science enthusiasts, and anyone interested in the theoretical aspects of time travel and the limitations imposed by the speed of light.

GomezMan91
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If you were to travel away from an object at a speed greater than light, would you begin to see that object go back in time? The way I have come to see it is that as you move away from an object at a speed greater than light, then you are eventually able to reach or pass light that was reflected from the object at an earlier time.
Any feedback on the subject would be most greatly appreciated as I am always eager to learn new things.
 
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We are already seeing into the past. If I were to photograph an object 100,000 light years from earth, I'm seeint it as it was 100,000 years ago.

ANYWAY, I think you would just see its redshift.
http://en.wikipedia.org/wiki/Redshift
 
GomezMan91 said:
If you were to travel away from an object at a speed greater than light.
You cannot do this.

Which is why there's no paradox.
 
DaveC426913 said:
You cannot do this.

Which is why there's no paradox.

oh come on. Use you imagination?:wink:
 
I believe that you may be able to 'look' back in time, because of the reflected light, but the actual object that is going faster than light, would not actually go back in time, as time would still be moving forward around the object, not going backwards. But, if I am right (doubtful), this would raise the question of, 'What happens when you stop moving?' Would you in fact, be at that time that you were viewing, or would land in you own time again? It might be arguable that as you slow down again, time might go forwards and as you slow down you will get closer to the time you started moving.
 
Thank you all for your insight on the subject

AzonicZeniths said:
'What happens when you stop moving?' Would you in fact, be at that time that you were viewing, or would land in you own time again?

If you were to suddenly stop you'd more than likely die :P. But if you were to stop what I think would happen is that you would start seeing time forward from the moment you stopped. Only if you start traveling towards the object at a speed greater than light would you be able to see into what to you at the time would be the future, but to the object would be the present and past.
 
Guys guys guys. This is claptrap. There is only heartbreak and sorrow (and locked threads) down this road.

You cannot travel faster than c. No object with mass can.

This is not merely quibbling. This is critical. To "use your imagination" to pretend that you can will generate all manner of silly, spurious paradoxes. "you'd see unicorns and elves"is as valid as any other answer.
 
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DaveC426913 said:
Guys guys guys. This is claptrap. There is only heartbreak and sorrow (and locked threads) down this road.

You cannot travel faster than c. No object with mass can.

This is not merely quibbling. This is critical. To "use your imagination" to pretend that you can will generate all manner of silly, spurious paradoxes. "you'd see unicorns and elves"is as valid as any other answer.


Tachyons?
 
DaveC426913 said:
Guys guys guys. This is claptrap. There is only heartbreak and sorrow (and locked threads) down this road.

You cannot travel faster than c. No object with mass can.

This is not merely quibbling. This is critical. To "use your imagination" to pretend that you can will generate all manner of silly, spurious paradoxes. "you'd see unicorns and elves"is as valid as any other answer.

Alright, since no object with 'mass' can go faster than light, let's bring in an object with a mass less than 0. Monatomic metals. These metals, when brought to a monatomic state, can potentially weigh less than zero, if heated/cooled to a certain temperature (unique to the metal), thus, having no detectable mass.
 
  • #10
GomezMan91 said:
Only if you start traveling towards the object at a speed greater than light would you be able to see into what to you at the time would be the future
You mean the past right?

But, if you went faster than light away from an object, then looked back, would you see into the future?
 
  • #11
AzonicZeniths said:
Alright, since no object with 'mass' can go faster than light, let's bring in an object with a mass less than 0. Monatomic metals. These metals, when brought to a monatomic state, can potentially weigh less than zero, if heated/cooled to a certain temperature (unique to the metal), thus, having no detectable mass.
Show me.
 
  • #12
DaveC426913 said:
Show me.
Well, I don't have enough posts to post URL's...so I will make 2 posts really quick.
 
  • #13
Tachyons are an excellent example of faster than light particles, and although being merely theoretical (for now), the future can undoubtedly bring things that we do not foresee now.
DaveC426913 said:
This is not merely quibbling. This is critical. To "use your imagination" to pretend that you can will generate all manner of silly, spurious paradoxes. "you'd see unicorns and elves"is as valid as any other answer.
If we don't imagine the impossible we can't accomplish the impossible. Imagination is one of our greatest gifts. Also a lot of current scientific material would have seemed "impossible" to many great scientists from hundreds of years back.
 
  • #14
GomezMan91 said:
If we don't imagine the impossible we can't accomplish the impossible. Imagination is one of our greatest gifts.
Yes. Absolutely. There's an Imagination Forum down the street.
 
  • #15
I'm locking this thread until one of the Physics mentors get a chance to look into it. In the meantime, perhaps we could all take this opportunity to have a read through the PF Guidelines, particularly the part on overly speculative posts.
 

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