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A red giant is a type of star in which the internal supply of hydrogen has been exhausted, leaving the star swollen to a large size with its expanding, cooling mass, and glowing with a reddish light.

The yellow dwarf star Sol is expected to become a red giant star in approximately five billion years.

In 2269, Spock fought illusory games against an Irapina on the planet Anomaly. One game was a theoretical manipulation of gravitational fields within the coronas of red giant stars in a binary star system. Spock's goal was to trigger a nova in one of the red giants, while an Irapina adjusted other forces of nature to prevent it. (TOS novel: Planet of Judgment)

When Benjamin Sisko was an Ensign, he watched from a distance as a red giant star went nova. (DS9 - Day of Honor novel: Armageddon Sky)

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Stellar classification
By class and type class O blue-violet starclass B blue starclass A blue-white starclass F white star (white dwarf) • class G yellow star (yellow dwarfyellow giant) • class K orange star (orange giant) • class M red star (red dwarfred giant) • green starbrown dwarfN-type starR-type starS-type starD-type star
By size or makeup black hole/black starcarbon starcollapsardwarf star (brown dwarfred dwarfwhite dwarfyellow dwarf) • giant star (blue giantred giantorange giantyellow giant) • Lazarus starmicrostarneutron star (magnetarpulsar) • protostarsupergiant starvariable starwhite holeWolf-Rayet star

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