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acesover Special user I believe I have 821 Posts 
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As you look at galaxies further and further away, they appear to be moving faster and faster away from us. And it is possible that they could eventually appear to be moving away from us faster than light. At that point, light leaving the distant galaxy would never reach us.
---------------------------------------------------------------------------------------------- I find this difficult to comprehend. By that I mean if traveling away from us, I do not see how we would never see the light that it emitted. However if traveling toward us I can understand never seeing it coming until it has past. However I am not a physicist. I am just thinking aloud or should I say thinking via the internet. Seems to me it would be like the V2 rockets that traveled faster than sound. They would hit and explode then you would hear them coming.
If I were to agree with you. Then we would both be wrong. As of Apr 5, 2015 10:26 pm I have 880 posts. Used to have over 1,000
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Potty the Pirate Inner circle 4633 Posts
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On Aug 26, 2014, acesover wrote: It's theoretical, but if space itself is expanding faster than the speed of light, light can never escape that expansion horizon. A bit similar to what happens with gravity in black holes. |
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LobowolfXXX Inner circle La Famiglia 1196 Posts
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"Theoretical physics can prove that an elephant can hang from a cliff with its tail tied to a daisy"
- Kevin Costner as Jim Garrison, JFK.
"Torture doesn't work" lol
Guess they forgot to tell Bill Buckley. "...as we reason and love, we are able to hope. And hope enables us to resist those things that would enslave us." |
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Potty the Pirate Inner circle 4633 Posts
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On Aug 26, 2014, LobowolfXXX wrote: I found an interesting documentary with Morgan Freeman about theories of what the edge of the Universe is. More and more scientists are accepting the concept of a "multiverse", which literally makes sense on many levels. http://www.dailymotion.com/video/xv6i29_......ortfilms |
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landmark Inner circle within a triangle 5194 Posts
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One sad side effect of this expansion is that most of the galaxies will have receded over this horizon in about 3 trillion years... (wiping sweat from brow) "Whew! I thought you said 3 billion for a moment there. You had me worried!"
Click here to get Gerald Deutsch's Perverse Magic: The First Sixteen Years
All proceeds to Open Heart Magic charity. |
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magicfish Inner circle 7016 Posts
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On Aug 26, 2014, landmark wrote: Lol |
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acesover Special user I believe I have 821 Posts
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Quote:
On Aug 26, 2014, Potty the Pirate wrote: Still makes no sense. The light emanating from said object traveling faster than light does not dissipate. While it can never be seen from the direction it is approaching I do not see why it cannot be seen from where it once was. Of course when seeing the light the object is not there just the light that said object omitted. Also just what is a "expansion horizon"? Is it just something someone came up with in order to explain what they believe? I have never heard of it before. While you said your version is theoretical is "expansion horizon" also theoretical and used only to further someone's idea? It does not sound logical. Again never seeing it approaching is logical as the light cannot leave the object fast enough but what it left behind does not go away. If the object stopped or slowed down less than the speed of ligh it would be able to be seen approaching. It is late. Good Night.
If I were to agree with you. Then we would both be wrong. As of Apr 5, 2015 10:26 pm I have 880 posts. Used to have over 1,000
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Potty the Pirate Inner circle 4633 Posts
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If you understand what I mean by "expansion horizon", you'll get it. I really can't remember if it's the correct term. Assume space is expanding between the observer and the source of light. Assume for the purposes of simplicity, that the objects are otherwise static relative to each other, and that it's only the expansion of space itself which is driving them apart.
When (if) that expansion ever happens at the speed of light, then any light passing through that region of space would have an ever-increasing distance to travel to escape. Any light that enters the region would carry on travelling through that same bit of space, as long as the expansion continues. It would not get to the "other side" of the expanding space, to where the observer is. |
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acesover Special user I believe I have 821 Posts
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I don't know what an "expansion horizon" is. As I said I never heard of it but I am not a physicist.
However I do not believe that your example of expanding space holds water as I believe it can only expand to where it never was. If it is expanding at all. It seems contradictory that space is expanding into space. Therefore once the light was given off from its source it will continue to travel in a straight line in the opposite direction (assuming it is also traveling at the speed of light). Therefore in one second the light would travel backwards 186,00 miles, while said object will have traveled 186,000 miles in the opposite direction putting the light source 372,000 miles from which it can be viewed after one second...remember we are only viewing the light emitted from the source not the source. Why would the space expand between the source of light and the viewer of light? If that were the case "NOTHINIG" would be visible. I do not believe that space can expand into space. Makes no sense. If space is really expanding it can I believe only expand outward not inward so the distance from the object omitting the light and the viewer of the light does not change. Of course my view is completely simplistic and not in the least bit scientific. I am only using examples of what I can fathom. Getting a headache. 
If I were to agree with you. Then we would both be wrong. As of Apr 5, 2015 10:26 pm I have 880 posts. Used to have over 1,000
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Harry the magic man Loyal user Spokane, Washington 270 Posts
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The Milky Way tastes like raspberries. The chemical that gives the berries their taste is present in space. Pretty cool.
Best wishes, Harry
Between the conception
And the creation Between the emotion And the response Falls the Shadow Life is very long- T.S. Eliot "The Hollow Men" |
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landmark Inner circle within a triangle 5194 Posts
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Quote:
On Aug 30, 2014, Harry the magic man wrote: Are you tommy's lost twin? Wait I get it--your profile says Regular user...
Click here to get Gerald Deutsch's Perverse Magic: The First Sixteen Years
All proceeds to Open Heart Magic charity. |
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acesover Special user I believe I have 821 Posts
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Quote:
On Aug 30, 2014, landmark wrote: OMG. Great post. I had to think about it a bit. Fantastic.
If I were to agree with you. Then we would both be wrong. As of Apr 5, 2015 10:26 pm I have 880 posts. Used to have over 1,000
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Jonathan Townsend Eternal Order Ossining, NY 27300 Posts
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Thanks for the article reference mr. c.
Any thoughts about the graininess experiment?
...to all the coins I've dropped here
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Magnus Eisengrim Inner circle Sulla placed heads on 1053 Posts
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On Aug 30, 2014, landmark wrote: My vote for Post of the Year!
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned; The best lack all conviction, while the worst Are full of passionate intensity.--Yeats |
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Potty the Pirate Inner circle 4633 Posts
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On Aug 28, 2014, acesover wrote: It's theoretical, as I said, and yes, it relies on the fact that space itself can expand. There is no reason to assume it cannot, as space and time are effectively "by-products" of energy and matter. Space and time are shaped by the activity of matter and energy within the Universe, this is already understood. As it is, we know pretty much for certain that the outer "edges" of the Universe are constantly receding rapidly, and that space within the Universe is affected by gravity and other factors. That's what much cutting edge astrophysics is based on. There are of course many, many theories out there, since no one has the definitive answer yet. However, I am of the camp which believes it's meaningless to talk about "empty space", since if there is no matter or energy present, there is, effectively, no space for it to exist in. The Universe therefore creates it's own space in which to exist as it expands. Some theories would argue that the Universe's expansion is not just at the perimeter, but could happen within, imagine a "tear" in space, leading to the effect we discussed. |
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R.S. Regular user CT one day I'll have 188 Posts
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Here's an interesting clip of Neil DeGrasse Tyson discussing the expanding Universe...
https://www.youtube.com/watch?v=s_H5fLJJcwg Ron
"It is error only, and not truth, that shrinks from inquiry." Thomas Paine
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Posted: Aug 26, 2014 04:45 am 
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