a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use red giant in a sentence
When the sun eventually becomes a red giant, its radius will actually reach outwards to Earth’s current orbit.Scientists Find the First Known Planet to Have Survived the Death of Its Star | Dimitri Veras | October 14, 2021 | Singularity Hub
The scientists hope to find more stars like the elderly red giant, which could reveal how frequent magnetorotational hypernovas are.Souped-up supernovas may produce much of the universe’s heavy elements | Mara Johnson-Groh | July 7, 2021 | Science News
Using images from the Hubble Space Telescope, astronomers found SN 2018zd’s progenitor, which turned out to be an old red giant.Astronomers just confirmed a new type of supernova | Monroe Hammond | June 29, 2021 | Popular-Science
By their hypotheses, a red giant would shed most of its mass before triggering its relatively small explosion.Astronomers just confirmed a new type of supernova | Monroe Hammond | June 29, 2021 | Popular-Science
The speed of the winds and how quickly a red giant loses mass as it slowly dies also play a role in making those shapes.Stellar winds hint at how planetary nebulae get their stunning shapes | Curtis Segarra | September 22, 2020 | Science News
The red giant had the advantage in height, if not in weight; the black giant in strength of muscle, if not in suppleness of limbs.Burl | Morrison Heady
There was the fleck of white high up near the top of the red giant, its white-dwarf companion in transit.Earthsmith | Milton Lesser
Roger de Conde spoke no English, and yet she had plainly heard English words upon this man's lips as he addressed the red giant.The Outlaw of Torn | Edgar Rice Burroughs
Nevertheless, he brought the car to anchor without a second's hesitation, drawing up alongside the humiliated red giant.My Friend the Chauffeur | C. N. Williamson and A. M. Williamson
But the question as to how the red giant stars were formed has received less satisfactory and precise answers.The Outline of Science, Vol. 1 (of 4) | J. Arthur Thomson
British Dictionary definitions for red giant
a giant star towards the end of its life, with a relatively low temperature of 2000–4000 K, that emits red light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for red giant
A giant star that has a relatively low surface temperature, giving it a reddish or orange hue. Red giants are non-main-sequence stars positioned in the upper right of the Hertzsprung-Russell diagram. They are not massive stars but rather late, expanded stages of lower-mass main-sequence stars that have exhausted the hydrogen in their core and are fusing their remaining hydrogen into helium in a luminous outer shell. The Sun is expected to become a red giant in about 5 billion years, expanding to 70 times its current size and bringing its surface extremely close to Earth's present orbit. See more at star. See Note at dwarf star.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.