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"Imagine a giant jungle gym, with galaxies at every intersection.
Suppose you are invested with the power to make that jungle gym grow in
all directions. (Maybe it's made of living bamboo!) What would that
look like, from the point of view of any individual galaxy? If the
jungle gym doubled in size, then a galaxy's closest neighbor would be
twice as far away--at a distance we might call 2 JU (for Jungle
Units)--and it would be receding. The most distant neighbors, let's say
ten junctions away, will also double in distance, ending up 20 JU away.
So, as viewed by that particular galaxy, all the others are receding,
and the more distant ones are receding faster. In fact, an expanding
framework produces Hubble's Law, with all galaxies seen as moving away
at velocities or recession just proportional to their distances." (p.
48)