red giant


Definition of red giant

: a star that has low surface temperature and a diameter that is large relative to the sun

Examples of red giant in a Sentence

Recent Examples on the Web This causes the entire star to bloat out into what’s known as a red giant. Mike Lynch, Twin Cities, "Skywatch: There’s a star in all of us," 15 Dec. 2019 At some point, these stars have exhausted the lighter elements that fueled their earlier existence, flared up into a bloated red giant, and burned down into carbon and oxygen rich cores not much larger than the Earth (but far more massive). John Timmer, Ars Technica, "White dwarf star covering itself with the atmosphere of a hot Neptune," 5 Dec. 2019 As a red giant, the star was huge—10 times larger than Earth's sun. David Grossman, Popular Mechanics, "Really Old Star Corpse Found Inside Another Really Old Star," 5 Aug. 2019 The Aldebaran, a red giant star that depicts the bull's eye, is Taurus's brightest star. Isabel Garcia, House Beautiful, "Attention Stargazers! This Weekend Is the Best Time to Watch the Night Sky," 26 Mar. 2020 That’s why Freedman set out to use tip of the red giant branch stars. Quanta Magazine, "New Wrinkle Added to Cosmology’s Hubble Crisis," 26 Feb. 2020 Around 1,000 years ago the central star ran out of fuel and swelled into a red giant. Charlie Wood, Popular Science, "Astronomers caught a star-on-star smack down," 10 Feb. 2020 When the sun someday balloons into a red giant, swallowing Mercury and Venus whole and scorching Earth will be just its first step in transforming the solar system. Charlie Wood, Popular Science, "Asteroids go to pieces when their host star dies," 12 Feb. 2020 Orion’s brightest stars are Rigel, marking one of the hunter’s knees, and the red giant star Betelgeuse at his armpit. Mike Lynch, Twin Cities, "Skywatch: Super chilled starry nights," 29 Dec. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'red giant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of red giant

1929, in the meaning defined above

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Time Traveler for red giant

Time Traveler

The first known use of red giant was in 1929

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Statistics for red giant

Last Updated

7 May 2020

Cite this Entry

“Red giant.” Dictionary, Merriam-Webster, Accessed 28 May. 2020.

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More Definitions for red giant

red giant


English Language Learners Definition of red giant

astronomy : a very large star that has a reddish color

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