Definition, Meaning & Synonyms

red giant

Noun

/rɛd ˈdʒaɪənt/

Definition

A red giant is a luminous giant star that is either in the later stages of stellar evolution after it has exhausted the hydrogen in its core.

Examples

The star Betelgeuse is one of the best-known red giants in the night sky.
As stars like the Sun evolve, they will eventually become red giants before shedding their outer layers.

Meaning

Red giants are characterized by their large size and reddish color, which results from the star’s outer envelope expanding and cooling as it runs out of fuel.