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

question 7

Multiple Choice

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.

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