Time travel

[renormalised (Carl)]

reasonable reality

Who said reality was reasonable...there are plenty of instances, and not just in science, that says otherwise.

[Robh (Rob)]

Just because the human mind can conjure an idea does not mean it exists in reality. For example, I can conjure images and stories of ghosts and perhaps even believe in ghosts, but that does not mean ghosts exist.

Time just reflects the passing of events. Conceptually, I can imagine a retrace of some events back to a point in time passed by. However, it is not possible to recreate the infinity of events that have occurred across the Universe for the last second, let alone for the last decade or 100 years.

Rob

[bobson (Bob)]

We can play it this way as well then

We use our scopes to collect light in order to see image of the object in the sky. Lets assume we are looking at the object that is 100 light years away from us. In other words it takes 100 light years for the light to get to us.
Now, lets assume we know something faster than light, twice as fast in fact. If we send that towards the mentioned object lets say 10 light years towards that object. Then record that object with it and send the image back to us again twice as fast as light.
We would be looking at the future of that object. In relevance to us of course, those things already happened as far as that object is concerned. So its a past for the object and future for us for that object.

See..its easy

bob

[FredSnerd (Claude)]

Einstein wondered how an “apparently” simultaneous event, observed by 2 observers, one in motion and the other stationery, could appear to occur at different times. The answer. It was not the speed of light but the speed of time that changed. How crazy is that. Time does not move at the same pace AND even crazier; time does not move at the same pace for all of us at the “same time”. The answers that are waiting for us out there are down right weird. Einstein proved that. I just wouldn’t be in too much of a hurry to dismiss anything at this stage.

[renormalised (Carl)]

Originally Posted by Robh

Just because the human mind can conjure an idea does not mean it exists in reality. For example, I can conjure images and stories of ghosts and perhaps even believe in ghosts, but that does not mean ghosts exist.

Time just reflects the passing of events. Conceptually, I can imagine a retrace of some events back to a point in time passed by. However, it is not possible to recreate the infinity of events that have occurred across the Universe for the last second, let alone for the last decade or 100 years.

Rob

The corollary of that is what we think is impossible doesn't mean it is, necessarily. We've hardly scratched the nature of what we perceive of as reality (that is a subjective perception, anyway). Yes, we can only go by what we know, but to then believe that what we know is close to the whole story is skating on very thin ice.

[Bobbyoutback]

Because Earth is not the best time keeper we now measure a second by the number of flicks of frequency wavelength of radiation emitted by atoms of cacsium (9,192,631,770 flicks a second ) .
But whats gets me is this " if you could measure a second near a black hole you would get the same number of flicks per second but those not near the black hole would find more time had passed , being near the black hole event horizon does effect the light of the oscillations of electromagnetic waves including the atoms we are made of .
As Einstein realized , light provides the only fundamental measure of both length & time in the universe .

If you have read this far I'm astounded

Cheers Bobby.

[Astro78]

Originally Posted by Robh

Just because the human mind can conjure an idea does not mean it exists in reality. For example, I can conjure images and stories of ghosts and perhaps even believe in ghosts, but that does not mean ghosts exist.

Alrighty that's a one argument

Originally Posted by Robh

However, it is not possible to recreate the infinity of events that have occurred across the Universe for the last second, let alone for the last decade or 100 years.

Well that's this thread covered

[shane.mcneil]

Won't the answer depend on what time actually is? I thought time was just the rate of change in physical processes including biological. We've invented a method of measuring that change (hours, minutes, seconds etc) which we call time, but it is not a real thing. Time dilation occurs because as you approach the speed of light, physical processes slow down and thus "time" goes slower. You could therefore "travel into the future" by simply letting the universe age faster than you are. Is that right?

Others believe that time is a separate entity that may be able to be "traveled through". But I thought that that was more a philosophical position than I scientific one???

[Robh (Rob)]

Originally Posted by Bobbyoutback

Because Earth is not the best time keeper we now measure a second by the number of flicks of frequency wavelength of radiation emitted by atoms of cacsium (9,192,631,770 flicks a second ) .
But whats gets me is this " if you could measure a second near a black hole you would get the same number of flicks per second but those not near the black hole would find more time had passed , being near the black hole event horizon does effect the light of the oscillations of electromagnetic waves including the atoms we are made of .
As Einstein realized , light provides the only fundamental measure of both length & time in the universe .

If you have read this far I'm astounded

Cheers Bobby.

I get it and I'm astounded!

Regards, Rob

[sjastro]

Originally Posted by Robh

I get it and I'm astounded!

Regards, Rob

It's only your common garden variety gravitational redshift at work.

Steven

[renormalised (Carl)]

Originally Posted by sjastro

It's only your common garden variety gravitational redshift at work.

Steven

And, Einstein grew lots of those in his garden

[sjastro]

Originally Posted by renormalised

And, Einstein grew lots of those in his garden

If he was Richard Feynman he probably would have smoked it.

[renormalised (Carl)]

Originally Posted by sjastro

If he was Richard Feynman he probably would have smoked it.

Until he became "red" in the face

[Robh (Rob)]

Originally Posted by sjastro

It's only your common garden variety gravitational redshift at work.

Steven

Add some gravitational nutrients and watch it grow!

Rob

[Bobbyoutback]

Originally Posted by Robh

I get it and I'm astounded!

Regards, Rob

HeHe Rob .

This may interest you :

Hawking came up with the idea of a small black hole evaporating away but leaving a naked singularity behind , that would create the edge of time exposed & be disastrous for physics .
If we took the mass of the earth & squeezed into a small black hole it would have a Schwarzschild radius of only about 10 - 13 cm , thats around the size of the nucleus of an atom !
The time elapsed since the big bang has been calculated enough for this to have happened & thus maybe reverse time itself .

Mentally I,m not equipped well to ponder distortions of time

Cheers Bobby .

[renormalised (Carl)]

Originally Posted by Bobbyoutback

HeHe Rob .

This may interest you :

Hawking came up with the idea of a small black hole evaporating away but leaving a naked singularity behind , that would create the edge of time exposed & be disastrous for physics .
If we took the mass of the earth & squeezed into a small black hole it would have a Schwarzschild radius of only about 10 - 13 cm , thats around the size of the nucleus of an atom !
The time elapsed since the big bang has been calculated enough for this to have happened & thus maybe reverse time itself .

Mentally I,m not equipped well to ponder distortions of time

Cheers Bobby .

A "black hole" Earth is much larger than that....just plug the numbers into the equation for radius...i.e,

R = 2GM/C^2

See what you get

You'll find it's 0.0088m or 9mm

[Bobbyoutback]

Originally Posted by renormalised

A "black hole" Earth is much larger than that....just plug the numbers into the equation for radius...i.e,

R = 2GM/C^2

See what you get

You'll find it's 0.0088m or 9mm

Whoops , thats huge compared to what I said, I've given the size of only a billion tonne sized asteroid mass then.

Any ideas on faster then light probability , I know the search for tachyons is kinda difficult as they would be moving back wards in time if they were going faster then light because at the speed of light there is no time left to go any faster .

Cheers Bobby .

[Nesti (Mark)]

Originally Posted by sjastro

If he was Richard Feynman he probably would have smoked it.

Or played Bongos with it.

Or made fun of it.

Or slept with it.
Or worse...I'm not going to mention anything about [Feynman] student orgies.

Yes, yes, it's common knowledge, don't shoot the messenger!

[sjastro]

Originally Posted by Nesti

Or played Bongos with it.

Or made fun of it.

Or slept with it.
Or worse...I'm not going to mention anything about [Feynman] student orgies.

Yes, yes, it's common knowledge, don't shoot the messenger!

I never knew he was into biological sciences.

[renormalised (Carl)]

Originally Posted by sjastro

I never knew he was into biological sciences.

Must've had a broad education