Final answer:
On an H-R diagram, the Sun is categorized as a main sequence star.
Explanation:
In an H-R diagram, the Sun is classified as a main sequence star. Main sequence stars, like the Sun, derive their energy from the fusion of protons to helium. They are the most common type of stars in the diagram, representing about 90% of all stars.
Learn more about Hertzsprung-Russell Diagram here:
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