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red giant

noun, Astronomy
a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue.
Origin of red giant
1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for red giant
  • They expected to see hot gas funneling from a cool red giant star into a hot, dense blue star.
  • It then inflates to many times its normal size, becoming an enormous red giant.
  • About the sun entering the red giant star cycle or another asteroid coming and hitting our planet cant be controlled by us.
  • One day the sun will distend into a red giant before it shrinks into a white dwarf.
  • Most experts think that the sun will enter its red giant phase in about five billion years.
  • At about eight billion years old, the star is now in the red giant stage, a late phase of stellar evolution in sunlike stars.
  • In the final stages of life, sunlike stars expand their surface layers and become red giant stars.
  • Eventually the larger star went supernova, leaving behind the neutron star, while the smaller star expanded into a red giant.
  • Over billions of years, our sun is transforming into a red giant.
  • What this means, though, is that the star is already past its red giant stage.
British Dictionary definitions for red giant

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
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red giant in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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