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