GK
THE UNIVERSE
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Question
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a graph that relates temperature and brightness of stars
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spectrograph
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apparent brightness
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absolute brightness
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Hertzsprung-Russell diagram
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main sequence
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Explanation:
Detailed explanation-1: -Hertzsprung-Russell diagram, also called H-R diagram, in astronomy, graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures).
Detailed explanation-2: -The upper left corner of an HR diagram includes the hot, bright, blue stars. The coolest stars are much fainter than the hot stars, and they lie at the lower right. The band connecting the hot, bright stars at the upper left to the cool, faint stars at the lower right is called the Main Sequence.
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