Re: Big Bang

[Alberto Monteiro]

Doug Pensinger wrote:
>
>1) Why do some galaxies collide if everything is supposed to be expanding?  I
>assume that the reason is some post BB phenomenon, but have no idea what that
>might be.
>
No, the reason is simpler than that. The expansion of the big U is a *global*
phenomenon, that doesn't prevent local collisions. The *problem* with
BB Theory is explaining *why* there are galaxies, and not just a uniform
soap of atoms :-)

Alberto Monteiro