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Parrots, tortoises and redwoods live a longer life than men do; Men a longer life than dogs do; Dogs a longer life than love does.Edna St. Vincent Millay
- (astronomy): A major grouping of stars that creates a narrow band from the upper left to the lower right when plotted by luminosity and surface temperature on a Hertzsprung-Russell diagram.
- The area on the Hertzsprung-Russell diagram in which the main sequence is located
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