The choices below each describe the appearance of an H-R diagram for a different star cluster.Which cluster is the youngest?
A) The diagram shows main-sequence stars of spectral types G,K,and M,along with numerous giants and white dwarfs.
B) The diagram shows main-sequence stars of all the spectral types except O and B,along with a few giants and supergiants.
C) The diagram shows main-sequence stars of every spectral type except O,along with a few giants and supergiants.
D) The diagram shows no main-sequence stars at all,but it has numerous supergiants and white dwarfs.
Correct Answer:
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