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Author Topic: How does speed of travel affect the ageing process?  (Read 15935 times)

Offline hamza

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we've all heard about that theory of relativity and the example people give about the twins with one at rest and growing old while the other movin with the speed of light and when returnin back to mother earth has stayed the same.. now heres my question.. biological changes like ageing and all that like cell cycle and replication will happen even without taking time as an entity or reference. even for someone movin with the speed of light.. although clocks will slow down for em but still the cellular changes should still happen and turn the child old.. whats ur take on that..
« Last Edit: 17/06/2010 09:40:55 by chris »


 

Offline donchiragjain10036

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Re: How does speed of travel affect the ageing process?
« Reply #1 on: 11/06/2010 04:49:41 »
It is not so.. What really happens it that when a body moves at the speed of light or close to the speed of light, then all the chemical processes taking place in the body actually stops or reduces.

If it happens so, there is no sort of aging in the body.
 

Offline JP

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Re: How does speed of travel affect the ageing process?
« Reply #2 on: 11/06/2010 05:40:57 »
If you're inside a rocket moving at nearly light speed, time will appear to flow normally for you. 

To someone sitting on earth while you zip by at nearly light speed, time will appear to be going very slowly for you.
 

Offline traveler

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Re: How does speed of travel affect the ageing process?
« Reply #3 on: 14/06/2010 00:52:22 »
This may be a NOOB kind of question. If you were in a the rocket at light speed for 1 year (round trip), would it feel like a year to you or to those that never left Earth. If it was one Earth year to those on the ground, how long would it be to the person in the rocket?
 

Offline tommya300

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Re: How does speed of travel affect the ageing process?
« Reply #4 on: 14/06/2010 03:57:41 »
Frame of reference...
 Traveling at the speed of light, you have just jumped into another realm as a photon.
Once there, you take on the photon's characteristics and you are locked there as a slave to energy!

Sometimes accumulating and reaching immense magnitudes of energy.

Sometimes approaching and never being able to reach zero momentum of rest, for eternity.

 In Italy, they name streets after this type of trip, Una Via...
« Last Edit: 14/06/2010 04:05:54 by tommya300 »
 

Offline graham.d

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Re: How does speed of travel affect the ageing process?
« Reply #5 on: 14/06/2010 12:51:32 »
Traveller, if you make your question (regarding the person doing the round trip) such that his speed is just very close to the speed of light it takes away the absolute impossibility and, mathematically, removes aspects of infinity. It is not possible to get to lightspeed.

If someone gets to near lightspeed and travels for a year (his time) then on return he would find the earth had aged much more. If he had travelled very close to lightspeed the earth could have aged many hundreds or thousands of years. If he could actually get to lightspeed this aging would be infinite.

Conversely, if the people on the ground could get a rocket to accelerate fast enough, without crushing the person inside, and got the rocket to close to lightspeed and arranged for the rocket to return, decelerate and land within 1 year, the person on-board may have only experienced a very short trip - perhaps a few minutes. You may notice that this is practically harder because of the high acceleration that the person on-board would have to endure, so perhaps you need to imagine he has a Star Trek type inertial dampener.

Edit: I was replying to Traveller rather than Hamza here.
« Last Edit: 14/06/2010 16:08:16 by graham.d »
 

Offline doppler1

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Re: How does speed of travel affect the ageing process?
« Reply #6 on: 14/06/2010 14:32:31 »
Where do I sign up to be the test dummy on this study? If the chemical processes start to be affected as you hit light speed, how will this impact on your breathing and diffusion of oxygen into your blood stream?
Same goes for all the other chemical processes...surely if your ageing slows down, so do other things as well.
 

Offline graham.d

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Re: How does speed of travel affect the ageing process?
« Reply #7 on: 14/06/2010 16:13:01 »
To be clear, to the person in the rocket ship time will pass quite normally. There is no difference between the ticking of clocks or biological time. The same for the earthbound person. It is just that the time passes at a diffferent rate in one frame of reference when viewed from the other frame.
 

Offline Geezer

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Re: How does speed of travel affect the ageing process?
« Reply #8 on: 15/06/2010 00:29:26 »
Where do I sign up to be the test dummy on this study? If the chemical processes start to be affected as you hit light speed, how will this impact on your breathing and diffusion of oxygen into your blood stream?
Same goes for all the other chemical processes...surely if your ageing slows down, so do other things as well.

As Graham says, time will pass quite normally at all locations. As all processes are determined by time at any location, everything will run quite normally  :D. That's the bit that might seem counterintuitive.
 

Offline traveler

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Re: How does speed of travel affect the ageing process?
« Reply #9 on: 17/06/2010 02:13:51 »
Thank you for the clarification.....almost. To a person on that rocket that traveled 10 trillion Km in that year, would it be a year to them? From the explanation above, it seems like it would be less than a year.
 Let me ask it in the opposite way. If a rocket left Earth at close to the speed of light and went straight for a year, it would be 10 trillion km away.
 To me it seems that the faster a rocket could travel, the exponentially further a space mission could go. If this were to be possible would it seem like the rocket crew lived to be hundreds of years old to everyone on Earth?
 

Offline Geezer

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Re: How does speed of travel affect the ageing process?
« Reply #10 on: 17/06/2010 03:40:30 »

Q: To a person on that rocket that traveled 10 trillion Km in that year, would it be a year to them?

A: Yes, it would be one year to them.

Q: If a rocket left Earth at close to the speed of light and went straight for a year, it would be 10 trillion km away.

A: Yes, the distance would be how far it could travel in one year.

Q: If this were to be possible would it seem like the rocket crew lived to be hundreds of years old to everyone on Earth?

A: Yes. I think that would be true, were it possible. (I think that was the premise of the first "Planet of the Apes" movie. The subsequent movies went into time travel, which does not appear to have much basis in science at this point in time.

The "trick" here is to dispel any notion that there is some sort of master clock for the Universe. Time is not a constant. For a particular body, time is a function of the conditions that body is subject to.

I found it difficult to think this way. From a Human perspective, time seems to be one of the constants we can rely upon. Unfortunately, we can't, and that's been proved again and again.

(Sorry for the Q: A: inserts, but it seemed like one way to minimize confusion.)
 

Offline graham.d

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Re: How does speed of travel affect the ageing process?
« Reply #11 on: 17/06/2010 08:57:54 »
Traveller, you may be confused by another consequence of Relativity. Although all parties would agree on the speed of the rocket, the distance in the direction of motion contracts (Lorentz contraction). The result of this is that what starts off as 10 trillion km becomes less distance as the rocket accelerates to near lightspeed. (All distances in the direction of travel are zero at lightspeed). To people on the ground it is just the rocket that is shortened. This may explain some apparent contradictions. None of this is very intuitive I'm afraid.
 

Offline traveler

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How does speed of travel affect the ageing process?
« Reply #12 on: 19/06/2010 01:21:58 »

Q: To a person on that rocket that traveled 10 trillion Km in that year, would it be a year to them?

A: Yes, it would be one year to them.

Q: If a rocket left Earth at close to the speed of light and went straight for a year, it would be 10 trillion km away.

A: Yes, the distance would be how far it could travel in one year.

Q: If this were to be possible would it seem like the rocket crew lived to be hundreds of years old to everyone on Earth?

A: Yes. I think that would be true, were it possible. (I think that was the premise of the first "Planet of the Apes" movie. The subsequent movies went into time travel, which does not appear to have much basis in science at this point in time.

The "trick" here is to dispel any notion that there is some sort of master clock for the Universe. Time is not a constant. For a particular body, time is a function of the conditions that body is subject to.

I found it difficult to think this way. From a Human perspective, time seems to be one of the constants we can rely upon. Unfortunately, we can't, and that's been proved again and again.

(Sorry for the Q: A: inserts, but it seemed like one way to minimize confusion.)

I guess that is why it is called relativity. Thank you for the help.
 

Offline andrewz

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How does speed of travel affect the ageing process?
« Reply #13 on: 16/09/2010 19:56:07 »
speed of light.. although clocks will slow down

Light speed will be, but I'm hard to believe about slow time...
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How does speed of travel affect the ageing process?
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