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Originally Posted by Pi Man
The center is not part of the baloon, it's inside it. Just as in this analogy, the center of the universe is not accessable to anybody in the universe, but technically there is a center.
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I'm not sure how accurate this analogy is. The balloon analogy is helpful, but once you start considering anything other than the 2-dimensional surface of the balloon, I think the analogy loses its accuracy. I hesitate to refer to places that are outside our universe since their existence can never be supported or falsified. I think the common explanation is that there simply is no center, or equivalently, since everything started jammed together in essentially the same, single place, then everyplace
was at "the center" and still is.
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Originally Posted by Sam5
So space is “dragging” our own galaxy through... through what... space?
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I think the raisin bread analogy works very well here. As the bread rises or expands, each raisin gets farther and farther from every other raisin. The bread (space) expands between each raisin (galaxy), and in a sense, the raisins get "carried along" with the expanding bread.
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Originally Posted by Sam5
What branch of physics is this?
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Classical physics?
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Originally Posted by Sam5
Explain to us exactly how space “expands”. Do space particles get bigger, or what? Does “new space” fill in the gaps in the “old space”? Does the old space “stretch” or what?
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I don't think this is exactly known. There's a lot about the natural world and universe that hasn't been figured out yet. But scientists have to base their theories on observations, and all indications lead to the conclusion that the universe is expanding.
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Originally Posted by Sam5
If we’ve got two rocks in front of us, and we move them apart, we see that the space between the rocks has “expanded”, but that’s because we moved the rocks. So how can the galaxies be moving away from us, thereby causing their light to redshift, yet you say they are “not moving”? Please explain in detail how that physically works.
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I'm sorry if science has not advanced to a level that meets your satisfaction, but instead of moving two rocks, consider two raisins in a rising loaf of bread. The appearance and reality is that they are separating, but the raisins are not moving
through the bread. The bread between them is expanding. As I said, I don't know if the actual mechanism for this phenomenon is known, but then, we don't know the actual mechanism for gravity either.
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Originally Posted by Kierein
I wish BA would send all these guys who say that space is expanding and that the galaxies are not moving to the "against the mainstream" board. That is such a stupid, ridiculous idea and misconception.
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When you have to claim that 99% of the scientific community is stupid and ridiculous, you might start to think about whether it is
you who has the misconception.