Speed of light and time

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Jim_Baur

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I should know this, but I do not!

How much does time slow down when moving at the speed of light?

Is the change great enough to effect the dating of the universe?

One may add any information that will help the amateur scientist.

THANKS!

In simple terms, is there an absolute time or is all relative?

Where is the “clock” that measures time?

Is time like math, a creation of the ability to reason?

THANKS!!!
 
Jim_Baur said:
I should know this, but I do not!

How much does time slow down when moving at the speed of light?
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It stops. The only entity that can travel with speed of light is photon. Time-space continuum however shrink to zero from a observer who travel with speed of life hence the observer cannot experience anything since nothing changes.
Jim_Baur said:
Is the change great enough to effect the dating of the universe?
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Dating of universe is not related to observer but it is zero from an observer who travel with speed of light.
Jim_Baur said:
One may add any information that will help the amateur scientist.

THANKS!

In simple terms, is there an absolute time or is all relative?
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Time is a relative concept. Only speed of light is absolute.
Jim_Baur said:
Where is the “clock” that measures time?
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What do you mean?
Jim_Baur said:
Is time like math, a creation of the ability to reason?

THANKS!!!
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You mean if it is subjective? Yes, it is subjective.
 
I’m just wondering why you’re asking these questions in the Philosophy forum instead of Google?
 
Years ago the comic Steven Wright asked, “If you are traveling at the speed of light and you turn the headlights on, does it do any good?”
 
There’s no clock that measures time. We make clock based on earth’s rotation that appear in day/night shifts, and calendar based on earth’s revolution around sun.

We could be living in infinity right now, if the universe is infinite. And our experience of time could probably only illusion of earth’s rotation & revolution around the sun, or movements of materials.
 
faithfulwannabe said:
We could be living in infinity right now, if the universe is infinite. And our experience of time could probably only illusion of earth’s rotation & revolution around the sun, or movements of materials.
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With the massive speed we are moving, as the planet going around the sun, and the sun going around the galaxy, and the galaxy moving somewhere…
I wonder how much our perspective of time is distorted with respect to the rest of creation.
 
vz71 said:
With the massive speed we are moving, as the planet going around the sun, and the sun going around the galaxy, and the galaxy moving somewhere…
I wonder how much our perspective of time is distorted with respect to the rest of creation.
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Well, as the bible says God’s 1 day is like 1000 years in our time. I don’t know if this is only a figure of speech or not. If it’s figure of speech then it could be relative for everyone. For example a person who is waiting for someone to meet in a place, where the other person is late, it could feel like forever.

Or if you do a very mundane work you don’t like, 1 day could feel like eternal torment. Lol

And if you live your life happy everyday, it could feel like only a blink of an eye.

I would choose the latter. 🙂

But then again, if God’s 1 day = 1000 years, then only 2 days have passed for God since Jesus’ time.
 
seagal said:
I’m just wondering why you’re asking these questions in the Philosophy forum instead of Google?
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It seems that Physics questions are often discussed on the Philosophy forum. I don’t know why!

The original question has already been answered. As velocity increases, mass increases, length decreases, and time slows down. So if a physical object were to approach the speed of light, it would become more massive, thinner in length, and have slowing time. AT the speed of light, its mass would be infinite, its length would be zero, and time would stop. So naturally, that could never happen.

I’m just projecting it a little further now, but I suppose that if the object actually *exceeded *the speed of light, its mass would become negative, its length would be negative, and time would go backwards.
 
vz71 said:
With the massive speed we are moving, as the planet going around the sun, and the sun going around the galaxy, and the galaxy moving somewhere…
I wonder how much our perspective of time is distorted with respect to the rest of creation.
Click to expand...
There’s a difference in the progression of time at the surface of the earth and at higher elevations. This difference is something that must be taken into account by the implementation of GPS. With time being relative to one’s gravitational and velocity reference frame there’s not really much of an independent measure of time to use. But that’s not a problem, our current systems of time seem to be sufficient.
 
By the way, talk about Revelation 20: The Thousand Years Reign.

Could it be 1000 years in God’s time or in human’s time?

If it’s in God’s time, how many years would it be? 360,000 years? That would be pretty looong time…
 
Time is not a substance. So it has no speed, in spite of Relativity. Show me a bit of time if you can. You can’t, so it is not a substance.

Linus2nd
 
Linusthe2nd said:
Time is not a substance. So it has no speed, in spite of Relativity. Show me a bit of time if you can. You can’t, so it is not a substance.

Linus2nd
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I think that the question was concerned with the effects on physical objects as they approached the speed of light.

As I understand it, when an object accelerates, it acquires move kinetic energy. (It takes energy to accelerate an object.) Since mass and energy are convertible using a particular formula, the object increases in mass. The time dilatation effect is barely noticeable at lower speeds but as the object approaches the speed of light, the time dilation becomes more and more pronounced.
 
JimG said:
I think that the question was concerned with the effects on physical objects as they approached the speed of light.

As I understand it, when an object accelerates, it acquires move kinetic energy. (It takes energy to accelerate an object.) Since mass and energy are convertible using a particular formula, the object increases in mass. The time dilatation effect is barely noticeable at lower speeds but as the object approaches the speed of light, the time dilation becomes more and more pronounced.
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Whatever the point of the O.P., it simply is not true that time " dilates, " because time is not a substance. If anything, it is a mental conctruct, marking duration in existence.

Linus2nd
 
Linusthe2nd said:
Whatever the point of the O.P., it simply is not true that time " dilates, " because time is not a substance. If anything, it is a mental conctruct, marking duration in existence.

Linus2nd
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However one wants to define time, the effect of time ‘slowdown’ as a result of acceleration has been experimentally verified. Clocks of any sort measure the passage of time at a slower rate on an accelerating object compared to one at rest.
 
JimG said:
However one wants to define time, the effect of time ‘slowdown’ as a result of acceleration has been experimentally verified. Clocks of any sort measure the passage of time at a slower rate on an accelerating object compared to one at rest.
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That is the catch 22. All clocks are made of material substances susceptible to the forces you describe. But time itself does not slow down. One moment is not faster or slower than the next, since a moment is simply now. So the clocks may speed up or slow down but time does not. In a non-accelerating universe the clocks tick away at the same speed.

Linus2nd
 
Is there a difference between: time, history, and physical being (created being)?
 
Linusthe2nd said:
That is the catch 22. All clocks are made of material substances susceptible to the forces you describe. But time itself does not slow down. One moment is not faster or slower than the next, since a moment is simply now. So the clocks may speed up or slow down but time does not. In a non-accelerating universe the clocks tick away at the same speed.

Linus2nd
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Many years ago I read a short science fiction story which was based on this very idea. It involved an astronaut traveling on the first spaceship toward a distant star and it was traveling at a substantial percentage of the speed of light. So while, say, 30 years of Earth time might pass, it was expected that onboard the ship, the clock would tick off perhaps six months, and the astronaut would experience the trip as a six month, not a 30 year, trip.

Everything worked as expected, including the time dilation effect. However, while the onboard clock ticked very slowly, the astronaut personally experienced time at the normal earth rate. Meanwhile all his physical processes worked very slowly indeed. His mind was experiencing things in ‘normal’ time while his body was drastically slowed down. It made for a very boring and horrific trip.

I’m no physicist, but I don’t think that’s how it will work. Our subjective experience of time is tied to our bodily perception of time, since we are a composite of body and soul. So I think in reality our subjective time would match our corporeal time and match the time dilation effect of near light speed travel.
 
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