Question

multiple - choice question

1. according to the text, what does the h - r diagram classify stars based on?

a. their age and size
c. their distance from earth
b. their luminosity and temperature
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Explanation:

The Hertzsprung - Russell (H - R) diagram is a graphical tool in astronomy that plots stars based on their luminosity (brightness) and surface temperature. It helps in understanding the life - cycle and characteristics of stars.

Answer:

B. Their luminosity and temperature