Ronn Blankenship wrote:
>
> Another model is a loaf of raisin bread rising. The raisins are the
> galaxies (or, probably more accurately, clusters of galaxies). As the
> bread rises, say it doubles in diameter in one hour. Then the distance
> between any two raisins also doubles during that hour. If two raisins
> were, say, 5 cm apart at the start, they would be 10 cm apart an hour
> later, and the average velocity of separation would be 5 cm/hour. Two
> raisins that were 10 cm apart at the start would be 20 cm apart at the end,
> and would be separating at 10 cm/hour, and so on, so the velocity is
> proportional to the distance between the raisins, which is the same thing
> we see with Hubble's law v=Hd.
>
and Alberto added
There is no void, because everything "real" [measurable]
is the skin of the balloon.
OK, let me ask it this way: What do we think is the shape of the universe?
Is it (roughly) an expanding sphere? Or is it not describable in terms of
shape?
Doug
