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Author Topic: Is light speed, c, the fastest speed in the Universe?  (Read 1151 times)

Offline Alan McDougall

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“Light thinks it travels faster than anything but it is wrong. No  matter how fast light travels, it finds the darkness has always got  there first, and is waiting for it.”   

Terry Pratchett

Is light speed c the fastest speed in the universe?

Alan
« Last Edit: 27/06/2016 13:48:17 by chris »


 

Offline Semaphore

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #1 on: 28/06/2016 15:13:15 »
In the universe, yes, I guess so. But space is expanding at an ever increasing rate so the further-most parts are retreating faster than the speed of light and have vanished, never to be seen again. Our long distant descendants - if we have any - will see the Milky Way but very little else.
 

Offline Alan McDougall

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #2 on: 28/06/2016 15:46:49 »
In the universe, yes, I guess so. But space is expanding at an ever increasing rate so the further-most parts are retreating faster than the speed of light and have vanished, never to be seen again. Our long distant descendants - if we have any - will see the Milky Way but very little else.

There is no limit as to how fast empty space can go it does not contain mass and is therefore, not subject to c!

The Raisin Bread loaf analogy

Galaxies for instant are embedded into the fabric of space something like raisins on a loaf of raisins bread.

Equate the dough of the raisin loaf to the fabric of space and the raisin to galaxies. The galaxies or raisins cannot travel thought the dough/space-time at greater than the speed of light. But the loaf can swell or the universe expand at greater than the speed of light taking the embedded galaxies or raisin with it for the ride.

Galaxies just like all things that have mass cannot exceed the speed of light through the fabric of space time, but they can recede from each other at greater than the speed of light because they are embedded into the fabric of the expanding universe at large "I hope that makes sense?
 

Offline Semaphore

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #3 on: 28/06/2016 15:56:34 »
That's what I said, init?
 

Offline IAMREALITY

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #4 on: 28/06/2016 16:01:19 »
That's what I said, init?

It's exactly what you said lol.
 

Offline PmbPhy

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #5 on: 28/06/2016 16:03:31 »
There are other speeds which are in excess of the speed of light. For example; if two long rods lying in close to the same plane are moving at speeds near the speed of light then their point of intersection can move faster than the speed of light. If you have a beam of light rotating in a plane and shines on a cylindrical wall then its possible that the spot on the wall will move faster than the speed of light. However in instances such there is nothing material moving faster than c. There is an SR text out which covers the subject of this thread. I'll take a look at it and get back to you.
 

Offline Semaphore

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #6 on: 28/06/2016 16:40:21 »
How about quantum entanglement, or spooky action at a distance, as Einstein said?
 

Offline Alan McDougall

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Re: Is light speed, c, the fastest speed in the Universe?
« Reply #7 on: 28/06/2016 17:05:53 »
That's what I said, init?

You did but I elaborated on it for those who are less informed than you!
 

The Naked Scientists Forum

Re: Is light speed, c, the fastest speed in the Universe?
« Reply #7 on: 28/06/2016 17:05:53 »

 

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