Exoplanetary Science
A red giant is a late-stage stellar evolution phase for stars that have exhausted the hydrogen fuel in their cores and expanded significantly in size. This phase is characterized by a cool outer envelope, which gives the star its reddish appearance, while the core contracts and heats up as it fuses helium into heavier elements. Red giants play a crucial role in the life cycle of stars and contribute to the chemical enrichment of the universe.
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