You Observe a Star Cluster with a Main-Sequence Turn-Off Point

You observe a star cluster with a main-sequence turn-off point at spectral type G2 (the same spectral type as the Sun) . What is the age of this star cluster?

A) 10,000 years.
B) 4.6 billion years.
C) 10 billion years.
D) 100 billion years.
E) You also need to know the luminosity class of the turn-off point to determine the age.

Correct Answer:

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