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View Full Version : Hidden Galaxies Ablaze with Star Formation



Fraser
2007-Aug-14, 07:06 PM
We have a few pockets of star formation here in the Milky Way. But new galaxies have been discovered, 12 billion light years away, with 1000 times as much star formation. ...

Read the full blog entry (http://www.universetoday.com/2007/08/14/hidden-galaxies-ablaze-with-star-formation/)

rmsparks
2007-Aug-15, 03:06 PM
Every now and then, it appears as though simple logic might refute some of the complex astrophysical assumptions or theories. This article "hidden galaxies ablaze with star formation" is one. If, for example, the universe began with a big bang, and it is expanding at an accelerating rate, two things come to mind. One is that galaxies could not collide as they would be ever distancing themselves from one another. Thus, this, in and of itself, would seem to negate the theory of one big bang. Is there some other complexity of the universe that would explain this apparent deviation from simple logic?

Another apparent irreconciliation of logic related to the big bang would be that if the universe began from a single point, then if you could look to the end of the universe, i.e., the beginning, all lines of sight would converge into a single point, another seemingly impossible situation.

antoniseb
2007-Aug-15, 03:28 PM
If... the universe began with a big bang, and it is expanding at an accelerating rate ... galaxies could not collide as they would be ever distancing themselves from one another.

If every atom were sitting still as space expanded around it you would be right, but gravity and photon pressure played an important role in the early universe causing large scale turbulence on such a scale that galaxies, and sometimes even galaxy clusters were/are able to collide.

if the universe began from a single point, then if you could look to the end of the universe, i.e., the beginning, all lines of sight would converge into a single point
Without inflation, or accelerated expansion you might be right about this.