Universe expanding and contracting

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mvisvitae

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The universe is constantly expanding and contracting...scientist can measure this somehow....when a new galaxy is formed it takes up space and when a galaxy is consumed or collapses it leaves a void....so all the other surrounding galaxies will adjust to the change..like bubbles in a soda glass - effervescent - does anyone have any thoughts on this....
 
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Saiph

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The univserse is only observed to be expanding, there is no evidence it is, or has been, contracting. There is actually evidence that it may never contract (the "accelerating expansion" results of recent surveys).<br /><br />New galaxies do not form anymore, they only formed in the past. When we see forming galaxies, it's billiions of years ago that it occured. When they formed, they only shifted gas and dust around into a more compact structure (the galaxy), they don't shift space around.<br /><br />Also, galaxies don't collapse, they do merge with other galaxies. This merger does require that surrounding galaxies adjust to the change, because the mass of the two galaxies are shifting positions and orbits, and thus their affect on nearby galaxies are different. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>
 
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mvisvitae

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Thanks that question has been on my mind since highschool Physics and no one ever had a plausible answer
 
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newtonian

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mvisvitae - Saiph is correct. Except that our local section of universe is not simply expanding - but it also contracting with some blue shifting towards the Great Attractor(s).<br /><br />The Oscillating universe theory, to which you may be alluding, is not supported by the more recent evidence - rather eternal expansion is indicated on the grand scale - i.e. beyond our more local 500 million ly section.<br /><br />Your mentioning of voids, however, is also correct.<br /><br />However, galaxies are not consumed and leave a void. The actual way voids are formed is an ongoing field of research.<br /><br />Here is one research inciting quote on this:<br /><br />"Still another problem for the big bang has come from steadily mounting evidence of “bubbles” in the universe that are 100 million light-years in size, with galaxies on the outside and voids inside. Margaret Geller, John Huchra, and others at the Harvard-Smithsonian Center for Astrophysics have found what they call a great wall of galaxies some 500 million light-years in length across the northern sky." - "Awake!," 1/22/96, p. 5.<br /><br />"The Milky Way, Andromeda, and some 20 other galaxies are bound gravitationally into a cluster, all of these being only a small neighborhood in a vast supercluster. The universe contains countless superclusters, and the picture does not end there.<br /><br />The clusters are not evenly distributed in space. On a grand scale, they look like thin sheets and filaments around vast bubblelike voids. Some features are so long and wide that they resemble great walls. This may surprise many who think that our universe created itself in a chance cosmic explosion. “The more clearly we can see the universe in all its glorious detail,” concludes a senior writer for Scientific American, “the more difficult it will be for us to explain with a simple theory how it came to be that way.”" - " Is There a Creator who cares about You?," 1998, pp.10,11<br /><br />I will research further on those bubbles and v
 
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Saiph

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well, saying local space is contracting towards the great attractor is a bit misleading. It appears that the gravitational influence of the great attractor (likely a very large galaxy cluster) is overcomming expansion, which allows the galaxies in the region to come closer together, in oposition to expansion's tendancy to cause them to drift apart. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>
 
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mvisvitae

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Not to sound too way out but if there was such a thing as an Intergalactic transportation system (via the wormholes) and since wormholes are set up like slinkies meaning they do oscillate - could the wormholes connect to one another hence pulling and pushing the galaxies closer together and farther apart ...do you think the wormholes are stationery or mobile and can connect and disconnect to other wormholes either randomly or through some sort of designed system (pehaps they have polar charged endings + and -)?
 
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harmonicaman

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If wormholes existed, there would have to be corresponding White Holes -- where matter was being emitted by the wormhole. No candidate White Holes have been observed in the universe.<br /><br />Although you can create theoretical mathematical models of wormholes, there are some pretty severe practical problems which such a concept would have to overcome to exist in reality.<br /><br />Time is stopped and there is no space within a black hole. The wormhole concept envisions a robust environment within a black hole which likely doesn't exist. <br /><br />The matter and energy in the universe is static -- it cannot be created nor destroyed (only interconverted). The matter and energy which was created during the big bang event remains forever the same, only the time and space continuously expands around it. <br /><br />For a wormhole to exist, there would have to be a working relationship between the static mass and ever changing time; but these two entities seem to lack any kind of interactive compatibility in our universe. <br /><br />Get enough mass together in one place and time and space are altogether expelled -- that's what a black hole is! The wormhole concept requires a better compatibility between "m" and "c" than we currently observe.
 
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dragon04

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<font color="yellow">If wormholes existed, there would have to be corresponding White Holes --</font><br /><br />Take a piece of paper. Make a very "skinny" U with it. Put an enourmously massive singularity dead center of the two sides of the open end of your U. The gravity of the singularity is acting equally on both sides of the open end.<br /><br />Where would the "white hole" be? <div class="Discussion_UserSignature"> <em>"2012.. Year of the Dragon!! Get on the Dragon Wagon!".</em> </div>
 
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thespeculator

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"No candidate White Holes have been observed in the universe."<br /><br /><br />The jet emmitted from most supermassive black holes?
 
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derekmcd

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It is believed that the jets are formed from the accretion disk around the black hole. That material is not being ejected from within the event horizon. Imagine your toilet bowl flushing... it splashes water outside the toilet. If the water spins fast enough, long enough... you will get a constant flow of water escaping. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>
 
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