The figure below shows the H-R diagram of stars from the cluster 47 Tucanae.Explain what the main-sequence turnoff is and how it can be used to determine the age of the cluster.
Definitions:
Abbreviation C'BORE
The shorthand notation for "Counterbore," indicating a cylindrical flat-bottomed hole that enlarges another hole, often to hide a fastener head.
Cutting-plane Line
A line on a drawing that indicates the imaginary plane where a part is cut to reveal internal features.
Deep
A descriptive term used in various contexts to indicate a considerable distance from the surface or edge, often related to the dimension of a feature.
Depth
The measurement from the top surface to the bottom in an object, often used to specify the extent of features such as holes or cuts.
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