On 23 January 2014 20:09, Pierz <[email protected]> wrote: > > I once heard a cosmologist say that you can't feel the force of repulsion > due to cosmological expansion between your fingers because at that distance > it is imperceptibly small. But if your fingers were at either end of the > universe you'd feel an immense pressure pushing them apart. >
If he's talking about dark energy, fair enough, although since we don't know what it is, I'm not sure how he could make that statement with confidence (about the force being there between your fingers, I mean). However, if he wasn't talking about dark energy, I don't understand. I don't think that the hubble flow *itself* involves a force. That is, the contents of the universe are moving apart (except where they're gravitationally bound) and they are interacting via gravity and dark energy, whatever that is.... and that's all that's involved. Cosmological expansion is simply movement, galaxies on either side of the universe aren't being pushed apart by anything *other* than dark energy, and not being pulled together by anything except gravity (as far as we know). There isn't a force of repulsion making the universe expand - apart from dark energy - it simply IS expanding. WAS he talking about Dark Energy? -- 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/groups/opt_out.
