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?

Question

Quizplus · Accepted Answer

The main-sequence turn-off point at spectral type G2 indicates an age of approximately 10 billion years. This is because stars of higher mass and luminosity than the Sun exhaust their nuclear fuel more quickly and therefore evolve faster, while lower mass stars evolve more slowly. Since the turn-off point is at the same spectral type as the Sun, this indicates an age of approximately 10 billion years, which is consistent with the estimated age of the Milky Way galaxy. The other options are incorrect as they do not correspond to the age of a typical star cluster.

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