Final answer:
Main-sequence stars dominate the Hertzsprung-Russell diagram, representing about 90% of all stars.
Explanation:
Main-sequence stars on the Hertzsprung-Russell (H-R) diagram constitute where most stars are located. These stars are aligned along a diagonal band with high temperature and high luminosity in the upper left, transitioning to low temperature and low luminosity in the lower right. Main-sequence stars, which make up about 90% of all stars, derive their energy from proton fusion.
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