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bjh bjh
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11 years ago
Contrast the appearance of the H-R diagrams of a young open and old globular cluster.
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11 years ago
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Astronomers noticed that there was a gap in the HR diagram of old clusters. Stars, that are rarely found in this gap, were found to vary in their brightness. The gap came to be known as the instability strip, since the stars inside that region appeared unstable. And the stars within the instability strip are known as variable stars.



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