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A red giant is a luminous, massive star in a late phase of its life cycle, specifically one that has a low or intermediate mass ranging from 0.5 to 10 solar masses. During this stage, the star’s outer atmosphere expands significantly, resulting in a large radius and a lower surface temperature, typically around 5,000 K or less. Red giants exhibit colors ranging from yellow-orange to deep red and belong to spectral types K, M, and S, as well as many carbon stars. Ultimately, our sun will evolve into a red giant in the later stages of its life.
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What Is it? • A red giant is a luminous giant star of low or intermediate mass (roughly 0.5–10 solar masses) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius immense and the surface temperature low, somewhere from 5,000 K and lower. The appearance of the red giant is from yellow orange to red, including the spectral types K and M, but also class S stars and most carbon stars.
???????????? • What this basically means is that a Red Giant is just a big, bright, red star as big as our sun with a low temperature and is in the last stage of its life. Eventually our sun will become one of these.
