On 29 November 2014 at 11:59, Richard Ruquist <[email protected]> wrote:
> I have wondered if space is expanding by adding on more space, keeping the > space of say our galaxy intact. > Or is the actual space within our galaxy getting bigger, along with each > of us. > And if the latter, how would we know.? > > The expansion of the universe doesn't include bound systems, like atoms or galaxies. If it was purely a scale expansion that applied to everything in existence we couldn't of course know about it (probably...depending on the exact details of how it worked...) GR posits that space-time is a continuum, which means that any part of it is able to expand indefinitely, so it isn't adding more space at any particular point. It's probably gives a more accurate picture to assume space is infinite (or at least finite but unbounded) and that the objects in it - above a certain scale - are moving apart at a uniform rate, i.e. that the separation velocity increases uniformly with distance apart. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
