Labels:bulletin board | reckoner OCR: expansion iS similar to a rising loaf of raisin bread The dough is analogous to space and the raisins to clusters of galaxies AS the dough expands, the raisins move apart Moreover, the speed with which any two raisins move apart is directly and positively related to the amount of dough separating them. The evidence for the expansion of the universe has been accumulating for some 60 years. The first important clue is the redshift A galaxy emits or absorbs some wavelengths of light more strongly than others If the galaxy is moving away from us these emission and absorption features are shifted to longer wavelengths that is they become redder as the recession velocity increases This phenomenon is known as the redshift. Hubble's measurements indicated that the redshift ofa distant galaxy is gr ...
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