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Physical Science with Earth and Science
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Stars: Properties, Life Cycles, and H-R Diagrams
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Physical Science with Earth and Science
9.146 Stars: Properties, Life Cycles, and H-R Diagrams
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An H-R diagram of nearby stars shows many cool, dim main sequence stars. Which explanation is most consistent with stellar lifetimes?
A
Low-mass stars are long-lived, so many remain visible on the lower main sequence.
B
Cool, dim stars are always red supergiants.
C
The diagram must be wrong because dim stars cannot be detected nearby.
D
Low-mass stars explode quickly, so they constantly reappear.
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