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staedtler staedtler
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7 years ago
An astronomer plots the H-R diagram of a star cluster and finds that it contains hot B-type stars on the main sequence and cooler G- and K-type stars noticeably above the main sequence. This cluster is
A)   of indeterminate age since one cannot estimate the age of the cluster from the information given.
B)   impossible because one cannot have cool stars above the main sequence when hot stars are on the main sequence.
C)   old because the G and K stars are already evolving off (away from) the main sequence.
D)   very young because the G and K stars are still evolving toward the main sequence.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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hyponoticahyponotica
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staedtler Author
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6 years ago
I really appreciate your help!
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