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The speed of light....

St3
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The speed of light....

If in the near future if we manage to be able to travel at the speed of light, what might our internet connections be like  Grin Will we still get lag Tongue
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Re: The speed of light....

Technically our internet IS speed of light. It's all sent down fibre optic cables all over the ocean floors etc. The only delay is the servers that process the information.
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Re: The speed of light....

Or when it reaches the twisted pair !  Roll eyes
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Re: The speed of light....

http://wiki.answers.com/Q/Speed_of_a_telephone_signal_in_a_copper_wire
Quote
The speed of light is approximately 3x10^8ms (exactly 299,792,458 m/s), but electric signals don't travel that fast in conductors. They travel anywhere from 40% up to 95% of that speed, depending on properties of the cable (the dielectric constant of the material surrounding the copper is a big factor).
Twisted pair copper cabling used in telephone wiring tends to be on the lower end, somewhere between 40% to 70%. So a good estimate is somewhere between 120,000,000 m/s to 210,000,000 m/s.
(The drift speed of electrons in a wire is much slower, on the order of millimeters per second. Electric signals travel through conductors as an electromagnetic wave.)

alanf
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Re: The speed of light....

Quote from: Oldjim
The speed of light is approximately 3x10^8ms (exactly 299,792,458 m/s),...

That's the speed of light in a vacuum. In glass it is approximately 2/3 of that speed.
http://en.wikipedia.org/wiki/Speed_of_light
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Re: The speed of light....

Tell me someome please how this theory equates with what I was taught at school that "the light from the sun takes 8 minutes to reach the earth ? (I was also taught that the sun is approximately 9million miles away) (I learned my linformation when we were imperial not metric)
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Re: The speed of light....

Apparently it's nearer 100 million miles (not that I've measured it).
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alanf
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Re: The speed of light....

Nearer still to nineTY million miles. I think that Community's memory  dropped a zero.
http://www.wolframalpha.com/input/?i=distance+earth+sun
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Re: The speed of light....

When I was a kid it was 93 million, now it's 94 million probably due to the expansion of the universe thing. Undecided
Anyway 8.5 minutes for the Sun's light to reach Earth and about 1.5 seconds for the Moon's reflected light to reach Earth.
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alanf
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Re: The speed of light....

The Earth's orbit is not circular but elliptical. The Sun-Earth distance varies throughout the year and the shape of the ellipse also noticeably changes over longer periods. The WolframAlpha link above says current Sun-Earth distance is 94.46 million miles. But is also says that is 1.02 times the mean distance.
94.46/1.02=92.16 so the mean distance is 92.16 million miles.
So, depending on which day of the year Strat was told the distance 93 million miles could have been correct.
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Re: The speed of light....

Quote from: ukste
If in the near future if we manage to be able to travel at the speed of light, what might our internet connections be like  Grin Will we still get lag Tongue

I'll still be on ADSL1
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Re: The speed of light....

Quote from: Oldjim
http://wiki.answers.com/Q/Speed_of_a_telephone_signal_in_a_copper_wire
Quote
The speed of light is approximately 3x10^8ms (exactly 299,792,458 m/s), but electric signals don't travel that fast in conductors. They travel anywhere from 40% up to 95% of that speed, depending on properties of the cable (the dielectric constant of the material surrounding the copper is a big factor).
Twisted pair copper cabling used in telephone wiring tends to be on the lower end, somewhere between 40% to 70%. So a good estimate is somewhere between 120,000,000 m/s to 210,000,000 m/s.
(The drift speed of electrons in a wire is much slower, on the order of millimeters per second. Electric signals travel through conductors as an electromagnetic wave.)

But that assumes we would be using cable, in the future connections might be via satellite, assuming this was the case how would this affect the figures ?
MJN
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Re: The speed of light....

The future of Internet connectivity is unlikely to be via satellite simply because of how far away they are and the latency they therefore introduce.
At a distance of some 35,000km from the Earth the signal takes upwards of 250ms for a round trip. Assuming we can't break the laws of Physics this limitation is here to stay. Some mitigation might be afforded by multiple feeds, optimisation (compression, spoofing, caching, etc) and inter-satellite routing but for outright performance it can't beat fibre and much shorter links.
Mathew
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Re: The speed of light....

When sub-space communications are developed latency shouldn't be as big a problem Smiley
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Re: The speed of light....

I was ust thinking the same Strat.  It was good enough for James Kirk after all.  From what I remember I'd assume he mainly used VOSS which would require pretty low latency for the distances involved.
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