On 29 November 2014 at 11:59, Richard Ruquist <yann...@gmail.com> 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
