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Originally Posted by AntonioLao
Globally speaking, the galaxies are really not moving away from each other at high radial velocities. Locally, there can be varities of motions between galaxies,which led to some collisions of galaxies and that one of the lingering cosmological mysteries is why do galaxies formed clusters and superclusters?
It is space itself that is expanding and the speed of the expansion is greater than the speed of light the farther away the galaxies are from each other (these superluminal speeds have been detected). This seems to imply that the size of the universe is larger than the size of its visible part. |
Your two paragraphs above seem to contradict each other, AntonioLao.
If the space between galaxies is expanding greater than the speed of light, than surely the galaxies have to be moving away from each other at greater than the speed of light (at least in conventional physics terms).
I'll have a look at March's Scientific America and see if it's any more illuminating about these 'misconceptions'.
The idea that space itself is expanding is getting closer to Steadybang Theory (see the 'Your TOE Theory' forum and
www.steadybang.com), where everything - matter and the space between it - is expanding. I think this makes more sense, but then, being it's author, I would.
Battybat.