An H-R diagram?
Answer Are
Is a map of the position of the stars
Graphs stars according to their size and distance
List every known star
Graphs a sample of stars according to surface temperature and absolute brightness
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  1. The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage.

    So the answer is D

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