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Do you believe in Time Traveller?

Kelpie

By Kelpie,
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Pocus

Pocus

Turbocharged

I believe in Time traveling however it's more on travelling into the past and you can only se the past and not change it. This is based on my understanding of quantum theory.

 

Eg. If you have a big and powerful telescope and you can see the nearest star which is around 13 million light years away. You are actually seeing the star 13 million years ago cos the image takes 13 million years in lightspeed to reach us. Maybe the star is already gone at this point of time!!

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SimonTan

SimonTan

2nd Gear

Expanding your telescope theory, you are almost on the right path.

 

If the universe can bend light, or if the milky way is revolving in a circular manner, there will come a time when the light emitting from earth will come full circle, and using a super power ful telescope to look at Earth, you will be able to see the ancient earth!!

 

Just take a look at the sun, what we see is 8mins old sun. Had the sun exploded, we will only see about it 8mins later!

 

People say we cannot travel faster than the speed of light.

but but, if two objects are travelling away each other at half the speed of light, then in actuali fact, one object is actually travelling at the speed of light against the other object!!

According to einstien theory, if you travel faster than the speed of light, you will be able to see the time going backward.

 

But the easiest time travel si going forward! Sorry, now i M going to time travel to tomorow 7am, gog night everyone.

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1fast1

1fast1

Supersonic
(edited)

People say we cannot travel faster than the speed of light.

but but, if two objects are travelling away each other at half the speed of light, then in actuali fact, one object is actually travelling at the speed of light against the other object!!

According to einstien theory, if you travel faster than the speed of light, you will be able to see the time going backward.

 

No. I had that misunderstanding when I was ...let's see... around 10 or so. I was excitedly telling a cousin about my grand method of going faster than light - have a cascade of spacecraft piggybacking on one another. I thought it was a practical limitation that people were talking about when they mentioned the speed of light barrier. Then I learnt the Special Theory of Relativity (STR).

 

What you're doing is called Galilean addition of velocities. Resultant velocity formed by summing two relative velocities, w = u + v. This is fine for Newtonian physics - which only approximates reality at low speeds, but fails for speeds close to that of light.

 

What you want is the relativistic addition formula. w = (u + v)/(1 + uv/c^2). c is the speed of light. You can see that when u = v = 0.5c, w = 0.8c. Even if both u and v are both *equal* to c, w is still only c, meaning that even from the perspective of a photon, another photon travelling directly away from it is only receding at the speed of light (not twice the speed of light like our intuition would assume).

 

BTW, STR sort-of allows for travel into the future - by travelling very close to the speed of light in Space (relative to the Earth) and then decelerating to rest then returning to Earth, one would have experienced a "personal clock" of only hours while the Earth would have experienced years. Problem is, the energy required to make something like this possible is pretty much impossible - so this will always be an impractical (albeit theoretically sound) method of time travel. But the theory has been amply proven with by studying the decay (and hence longevity or passage of "personal time") of very light subatomic particles in particle accelerators. (Oh, one cannot "return" to one's "own time" with this method).

 

And the reason noone can actually travel faster than the speed of light is that to even reach the speed of light, one would need infinite energy (and one's mass would become infinite). Reaching c is impossible (for any particle with mass), exceeding it is also impossible - the mass term becomes imaginary (square root of a negative number), for instance. Tachyons (theoretical particles with a speed greater than c) are permissible, because they've "always" been travelling faster than c, they never needed to be accelerated from below c to above c (and they can never be decelerated to below c). And they have an imaginary mass and travel backward through time, so we'll never observe them directly.

Edited by Turboflat4
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Yattokame

Yattokame

4th Gear

What you want is the relativistic addition formula. w = (u + v)/(1 + uv/c^2). c is the speed of light. You can see that when u = v = 0.5c, w = 0.8c. Even if both u and v are both *equal* to c, w is still only c, meaning that even from the perspective of a photon, another photon travelling directly away from it is only receding at the speed of light (not twice the speed of light like our intuition would assume).

 

lorentz transformation?

 

man. thats nostalgic.

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relacker

relacker

Clutched

No. I had that misunderstanding when I was ...let's see... around 10 or so. I was excitedly telling a cousin about my grand method of going faster than light - have a cascade of spacecraft piggybacking on one another. I thought it was a practical limitation that people were talking about when they mentioned the speed of light barrier. Then I learnt the Special Theory of Relativity (STR).

 

What you're doing is called Galilean addition of velocities. Resultant velocity formed by summing two relative velocities, w = u + v. This is fine for Newtonian physics - which only approximates reality at low speeds, but fails for speeds close to that of light.

 

What you want is the relativistic addition formula. w = (u + v)/(1 + uv/c^2). c is the speed of light. You can see that when u = v = 0.5c, w = 0.8c. Even if both u and v are both *equal* to c, w is still only c, meaning that even from the perspective of a photon, another photon travelling directly away from it is only receding at the speed of light (not twice the speed of light like our intuition would assume).

 

BTW, STR sort-of allows for travel into the future - by travelling very close to the speed of light in Space (relative to the Earth) and then decelerating to rest then returning to Earth, one would have experienced a "personal clock" of only hours while the Earth would have experienced years. Problem is, the energy required to make something like this possible is pretty much impossible - so this will always be an impractical (albeit theoretically sound) method of time travel. But the theory has been amply proven with by studying the decay (and hence longevity or passage of "personal time") of very light subatomic particles in particle accelerators. (Oh, one cannot "return" to one's "own time" with this method).

 

And the reason noone can actually travel faster than the speed of light is that to even reach the speed of light, one would need infinite energy (and one's mass would become infinite). Reaching c is impossible (for any particle with mass), exceeding it is also impossible - the mass term becomes imaginary (square root of a negative number), for instance. Tachyons (theoretical particles with a speed greater than c) are permissible, because they've "always" been travelling faster than c, they never needed to be accelerated from below c to above c (and they can never be decelerated to below c). And they have an imaginary mass and travel backward through time, so we'll never observe them directly.

 

 

God can since He is the infinite source of energy! in bible he made the sun stood still while the Israel fought ,led by Joshua.

 

Then he fufill king hezekiah wish by moving the shadows back 10 steps. it was proven by scientist the missing days since singularity that thereare 2 missing days , but they are explain in the bible

 

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1fast1

1fast1

Supersonic

God can since He is the infinite source of energy! in bible he made the sun stood still while the Israel fought ,led by Joshua.

 

Then he fufill king hezekiah wish by moving the shadows back 10 steps. it was proven by scientist the missing days since singularity that thereare 2 missing days , but they are explain in the bible

 

God?! As Laplace told the Emperor Napoleon, "I have no need of that hypothesis."

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relacker

relacker

Clutched
(edited)

God?! As Laplace told the Emperor Napoleon, "I have no need of that hypothesis."

 

 

Same with Pilate when he ask Jesus 'what is truth?' when Truth is standing b4 him. Too bad God does not believe in atheist [laugh]

Edited by relacker
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Bighappyjer

Bighappyjer

1st Gear

God can since He is the infinite source of energy! in bible he made the sun stood still while the Israel fought ,led by Joshua.

 

Then he fufill king hezekiah wish by moving the shadows back 10 steps. it was proven by scientist the missing days since singularity that thereare 2 missing days , but they are explain in the bible

http://www.snopes.com/religion/lostday.asp

 

sorry, don't post forwarded chain emails and urban legends and portray them as fact.

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Good-Carbuyer

Good-Carbuyer

1st Gear

From Yahoo! News:

 

http://sg.video.yahoo.com/watch/8477659/22650978

 

Using Mobile phone in year 1928? Probably someone from Woodbridge equivalence talking to herself. No mobile network then, how to talk? damn funny [laugh]. The poster think too much [cool].

 

Regards,

If you are kidding with us, this is ticklish. Cordless phones/walkie-talkies/mobiles are held in the same position during conversation. Why you choose to discounted them?

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1fast1

1fast1

Supersonic
(edited)

Too bad God does not believe in atheist [laugh]

 

That's OK, the feeling's mutual. [laugh]

 

Now please go and spout your evangelistic claptrap (remove "lapt" for alternative implication) to someone who cares. Preferably on another forum far far away.

Edited by Turboflat4
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Tom_kkh

Tom_kkh

1st Gear

even if the lady travel back to time, do they have the infrastructure for mobile phone to work at that time...

 

a mobile phone is useless if no telecom cannot support it... think...

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