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On 1/18/07, frederth@saline.k12.mi.us <frederth@saline.k12.mi.us> wrote:
OK. I know that the Hubble Law states that recessional velocity of
distant galaxies is greater as distance increases. However, I am
forgetting why this should be intuitively correct?
Try this simple demonstration of a "one-dimensional universe" (which I
learned from our intro astronomy course). Take a slinky and stretch it out
a little bit; fix the ends down so that it remains slightly stetched (w've
attached blocks of wood to the ends of a plastic slinky). Now, attach paper
clips or post-it notes at various positions, and label them 1, 2, 3, 4, 5,
6, etc (these represent galaxies). Now, measure the distance between, say,
marker 3 (your "home" galaxy) and the other markers. Now, stretch the
slinky some known distance. Measure the distances again. Stretch the
slinky again the same known distance as before, and measure the distances
again. That should be enough, but you can do this as many times as you'd
like.