"People of a certain age look back on the Mayberry of 'The Andy Griffith Show' and become almost as homesick for that simple fictional hamlet as they do for their own home towns."

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Picture yourself during the early 1920's inside the dome of the Mount Wilson Observatory. ... Humason is showing Shapley stars he had found in the Andromeda Nebula that appeared and disappeared on photographs of that object. The famous astronomer very patiently explains that these objects could not be stars because the Nebula was a nearby gaseous cloud within our own Milky Way system. Shapley takes his handkerchief from his pocket and wipes the identifying marks off the back of the photographic plate.

— Halton Arp