What classification describes the stage in the H-R diagram where the Sun spends most of its existence?
Answer
The main sequence
The Hertzsprung-Russell (H-R) diagram is a crucial tool used by astronomers to categorize stars based on their luminosity and spectral type. The Sun, classified as a G2V star, sits comfortably on the main sequence, which is depicted as the diagonal band on this diagram. Stars spend the overwhelming majority of their active lives on the main sequence while they are stable, fusing hydrogen fuel in their cores. Once the core hydrogen is exhausted, stars like the Sun evolve off this sequence, eventually transitioning into giants or supergiants before their final stages.
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