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How do astronomers know that globular clusters are very old?

symbo

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7 years ago

How do astronomers know that globular clusters are very old?

How do astronomers know that globular clusters are very old?
A)   They do not contain any red giant stars.
B)   There are no main-sequence stars in globular clusters.
C)   Their stars have a high abundance of heavy elements.
D)   There are no massive main-sequence stars in globular clusters.

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Discovering the Universe

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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symbo Author

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6 years ago

Thanks for answering, I'll share this with my classmates too

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