Scientists often suggest that the expansion of the universe is similar to the expansion of raisin bread as it bakes in an oven. As the loaf increases in size, individual raisins move farther apart in the expanding bread. During a homework assignment, two students suggest the following analogies for the universe, but these are not considered as good as the raisin bread analogy. Why?
a) The universe expands similarly to the concentric ripples formed when a rock is thrown into a pond.
b) The universe is similar to a Jell-O mold enclosing pieces of fruit (galaxies).
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