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

Astrophysical models can accurately predict the highest temperatures and pressures at which a helium flash takes place, allowing researchers to discern the peak brightness a red giant can reach. Leila Sloman, Scientific American, "Hubble Tension Headache: Clashing Measurements Make the Universe's Expansion a Lingering Mystery," 29 July 2019 Instead, her team looked toward old, swollen stars called red giants. Joshua Sokol, Science | AAAS, "Debate intensifies over speed of expanding universe," 19 July 2019 But the latest study is relying on a different kind of stars called red giants. Ashley Strickland, CNN, "Red giant stars create new way to measure how quickly the universe is expanding," 16 July 2019 Your voices may still speak for us when our sun has become a red giant and all terrestrial remnants of our existence have been reduced to ash. Ann Druyan, National Geographic, "Dear Voyagers: How your billion-year journey carries true love," 10 July 2019 Antares, a red giant star just to the lower right of Jupiter, is the brightest star in Scorpius and marks the heart of the beast. Mike Lynch, Twin Cities, "Sky Watch: There are many delights to be found in August’s evening skies," 4 Aug. 2019 The red giant star is 35,000 light-years from Earth, in the Milky Way's halo. Ashley Strickland, CNN, "Ancient star discovery sheds light on Big Bang mystery," 1 Aug. 2019 Death: In 5 billion years or so, the sun will run out of its hydrogen fuel and expand into a type of star called a red giant, likely consuming Earth along the way. Stephen Ornes, Discover Magazine, "Our Sun, the Still-mysterious Star That Gives Us Life," 12 June 2019 The red giant phase is actually a prelude to a star shedding its outer layers and becoming a small, dense body called a white dwarf. Catherine Zuckerman, National Geographic, "Everything you wanted to know about stars," 20 Mar. 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.

See More

First Known Use of red giant

1929, in the meaning defined above

Keep scrolling for more

Learn More about red giant

Statistics for red giant

Last Updated

25 Sep 2019

Look-up Popularity

Time Traveler for red giant

The first known use of red giant was in 1929

See more words from the same year

Keep scrolling for more

More Definitions for red giant

red giant


English Language Learners Definition of red giant

astronomy : a very large star that has a reddish color

Comments on red giant

What made you want to look up red giant? Please tell us where you read or heard it (including the quote, if possible).


friendly or mild

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!