For an astronomer, what is the significance of the turnoff point in the Hertzsprung-Russell diagram of a star cluster?
A) The turnoff point tells the astronomer the age of the star cluster.
B) The turnoff point tells the astronomer which stars might be about to explode as supernovae.
C) The turnoff point tells the astronomer which stars pulsate in brightness (variable stars) .
D) The turnoff point tells the astronomer the metal content of the star cluster.
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