Universe expansion rate and going "back in time"

[pezinho]

If the universe is expanding at an accelerated rate. At which rate is the universe actually expanding and is this rate based on a center point? After all if something is expanding and is measured it has to be measured from a starting point.<br /><br />Now, if this acceleration rate is calculated from a starting point. Would it not be feasible to think that if one could travel to this starting point faster than the rate at which the universe is expanding than in theory would be travelling back in time because if the universe is expanding at an incredible rate one would think that there would be an "image" left behind if one was travelling back to the starting point faster than the expansion rate?

 

[search]

Hello "little foot" welcome<br /><br />Just to start but there many other better sites<br /><br />There is today many theories and universe models but there is something called scientific consensus<br />http://en.wikipedia.org/wiki/Scientific_consensus<br /><br />There was singularity called Big Bang but no starting central point. This means that the universe had an initial moment but started everywhere. The universe is now understood according with the "scientific consensus" as on an accelerated rate of expansion. Everything (with exception of nearby galaxies) is getting further away from eachother.<br /><br />Read this Q&A<br />http://www.astro.ucla.edu/~wright/cosmology_faq.html<br />accelerated rate of expansion<br />http://www.astro.ucla.edu/~wright/cosmology_faq.html#CC<br />Universe center<br />http://www.astro.ucla.edu/~wright/nocenter.html<br />Hubble Constant<br />http://www.astro.ucla.edu/~wright/cosmology_faq.html#H0<br />Read:<br />http://en.wikipedia.org/wiki/Metric_expansion_of_space<br />http://en.wikipedia.org/wiki/Lambda-CDM_model<br /><br />Then if you did not find the answer to your question or have more "kick your pezinho" again...<br />Enjoy sdc

 

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Last part of your question<br />Going back faster than the expansion...<br />If you could travel faster than the expansion I guess you could travel back in time. The problem is that even when you would travel back you are embeded in the spacetime medium and you must think that it is not the galaxies that are expanding but the space itself so you would still be travelling at whatever speed you would minus the speed of the expansion speed and then would require you to travel faster than light which in the standard models is not possible.<br /><br />But theoretically yes that would be time travel