Richard Ruquist 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.? Richard
Space is expanding uniformly. But the rate is slow when measured over small distances, so the force pulling two nearby points apart is very small -- easily overcome by the gravitational attraction between large nearby bodies, such as the stars that make galaxies and clusters of galaxies. These hold their size and do not expand with the geral expansion. It is only more distant, non-bound galaxies that move apart.
Bruce
On Fri, Nov 28, 2014 at 5:12 PM, Bruce Kellett <bhkell...@optusnet.com.au <mailto:bhkell...@optusnet.com.au>> wrote:LizR wrote: The point is that galaxies should be expanding in relation to bound systems like stars and the solar system, in a similar manner to the universe though for a different reason (so almost certainly not at the same rate). And that should be visible as we look back in time. So it's an acid test for this whole theory ... unless I screwed up, of course, which is why I was hoping people would comment a bit more cogently than the earlier reply I got (not from you) It is not at all clear what you are talking about. When you delete all context your point becomes obscured. Why the distinction between galaxies and other bound states? Galaxies and clusters of galaxies are as much gravitationally bound states as stars and solar systems. I don't understand why you should expect them to expand, unless dark matter is decaying and radiating energy out of the system. This is not happening at any noticeable rate, so what's the theory in question? Bruce
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