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Originally Posted by grant hutchison
I think the reason no-one knows is that it is an ill-posed question: you're inserting an assumption that there's a thing called "space" which must behave in one of these two ways.
In fact, the phrase "space expands" is just a metaphor for the mathematics, which describe a set of coordinates expanding, so that points within the coordinate frame move apart as time goes by.
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And as far as I understood it, cosmological redshift is an artefact of the expanding coordinates. Use non-expanding coordinates and all the observed redshift becomes Doppler, and super-luminally receding galaxies become sub-luminal. I'm still not 100% sure on that (despite learning it from Ned Wright's cosmology tutorial) because knowledgeable people like you always seem to shy away from agreeing with it 
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There are 10 types of people in the world. Those who understand ternary, those who don't, and those waiting for a bus.
If logic doesn't work, then surely it does.
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