Red giant

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What Wikipedia says

A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses (M☉)) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K [K] (4,700 °C; 8,500 °F) or lower.

Excerpt from the Wikipedia article “Red giant”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: A. Chiavassa, R. Kudritzki, B. Davies, B. Freytag and S. E. de Mink, CC BY 4.0, via Wikimedia Commons.