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What do we mean by the main-sequence turnoff point of a star cluster, and what d

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What do we mean by the main-sequence turnoff point of a star cluster, and what d

What do we mean by the main-sequence turnoff point of a star cluster, and what does it tell us?
A) It is the spectral type of the hottest main sequence star in a star cluster, and it tells us the cluster's age.
B) It is the point in a star cluster beyond which main sequence stars are not found, and it tells us the cluster's distance.
C) It is the luminosity class of the largest star in a star cluster, and it tells us the cluster's age.
D) It is the mass of the most massive star in the star cluster, and it tells us the cluster's size.

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killian Author

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