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staedtler staedtler
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7 years ago
The age of a cluster of stars can be judged by
A)   the amount of radioactive elements detected on the surfaces of its stars.
B)   the turnoff point on the main sequence of its Hertzsprung-Russell diagram.
C)   the total number of stars within the cluster.
D)   the number of novae per year occurring within the cluster.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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7 years ago
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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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