by Anthony Barreiro » Mon Mar 25, 2013 7:36 pm
MargaritaMc wrote:Ann wrote:bystander wrote:
The universe is not expanding into anything. Nothing exists outside the universe.
May I perhaps sort of disagree.
The universe isn't expanding into anything, no. From our point of view, the universe is everything. From our point of view, there can be nothing outside the universe.
But there just might be other universes. If so, they exist outside our universe.
Of course, we will never be able to see or otherwise detect any of these other, possible universes.
That's how I understand it anyway.
Ann
http://www.newscientist.com/mobile/article/dn23301
Bruised cosmos
Planck has also confirmed WMAP's detection of a large unexplained cold spot in the CMB, which some cosmologists took as a sign that there are universes beyond our own. One model of inflation, called eternal inflation, suggests that new universes are continually popping into existence (Note by Margarita - see quotation and link below) and expanding. This expansion could cause another universe to collide with ours, creating a "bruise" that would show up as a cold spot in the sky.
http://www.newscientist.com/mobile/arti ... erses.html
Microwave radiation map hints at other universes
Update on 16 August 2011: The researchers ran additional statistical checks on the CMB data, looking at the probability that the bubbles would appear anywhere on the sky. Lead author Stephen Feeney says: "The current data favour no bubble collisions. However, a non-zero number of bubble collisions is still allowed, and there are four patches in the WMAP data where [signals of possible bubble universes] are higher than anything we expect from systematic errors due to instrumental effects, foreground-removal artefacts etc. With data from Planck we expect our pipeline to be sensitive to much weaker collision signals, so we should be able to test whether there is something there or whether they're just weird patches of CMB." The updated analysis appears in Physical Review Letters (DOI: 10.1103/PhysRevLett.107.071301).
expanding_universe.jpeg
Margarita
I have enough trouble understanding one universe. It seems like asking for trouble to speculate about a multitude of other universes that we will never see.
![Wink :wink:](./images/smilies/icon_wink.gif)
My own personal belief is that we will never know everything, our theories and models will always be imperfect, and even this one universe will always be bigger, more complex, and more mysterious than we can possibly understand. Still, there is great value in striving for greater knowledge and understanding. And to have a better map of the universe 380,000 years after the big bang than we had a few years ago is an impressive accomplishment.
[quote="MargaritaMc"][quote="Ann"][quote]bystander wrote:
The universe is not expanding into anything. Nothing exists outside the universe.[/quote]
May I perhaps sort of disagree.
The universe isn't expanding into anything, no. From our point of view, the universe is everything. From our point of view, there can be nothing outside the universe.
But there just might be other universes. If so, they exist outside our universe.
Of course, we will never be able to see or otherwise detect any of these other, possible universes.
That's how I understand it anyway.
Ann[/quote]
http://www.newscientist.com/mobile/article/dn23301
[quote][b] Bruised cosmos [/b]
Planck has also confirmed WMAP's detection of a large unexplained cold spot in the CMB, which some cosmologists took as a sign that there are universes beyond our own. One model of inflation, called eternal inflation, suggests that new universes are continually popping into existence [color=#00BFFF] [i] (Note by Margarita - see quotation and link below)[/i] [/color] and expanding. This expansion could cause another universe to collide with ours, creating a "bruise" that would show up as a cold spot in the sky.[/quote]
http://www.newscientist.com/mobile/article/dn19887-microwave-radiation-map-hints-at-other-universes.html
[quote][b] Microwave radiation map hints at other universes[/b]
Update on 16 August 2011: The researchers ran additional statistical checks on the CMB data, looking at the probability that the bubbles would appear anywhere on the sky. Lead author Stephen Feeney says: "The current data favour no bubble collisions. However, a non-zero number of bubble collisions is still allowed, and there are four patches in the WMAP data where [signals of possible bubble universes] are higher than anything we expect from systematic errors due to instrumental effects, foreground-removal artefacts etc. With data from Planck we expect our pipeline to be sensitive to much weaker collision signals, so we should be able to test whether there is something there or whether they're just weird patches of CMB." The updated analysis appears in Physical Review Letters (DOI: 10.1103/PhysRevLett.107.071301).[/quote]
[attachment=0]expanding_universe.jpeg[/attachment]
Margarita[/quote]
I have enough trouble understanding one universe. It seems like asking for trouble to speculate about a multitude of other universes that we will never see. :wink: My own personal belief is that we will never know everything, our theories and models will always be imperfect, and even this one universe will always be bigger, more complex, and more mysterious than we can possibly understand. Still, there is great value in striving for greater knowledge and understanding. And to have a better map of the universe 380,000 years after the big bang than we had a few years ago is an impressive accomplishment.