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red giant
(redirected from Red-giant)

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
red giant
n.
A star of great size and brightness that has a relatively low surface temperature.

red giant
n
(Astronomy & Space / Celestial Objects) a giant star towards the end of its life, with a relatively low temperature of 2000-4000 K, that emits red light

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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.red giant - a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun
star - (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior


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Byline: ANI Washington, Nov 19 (ANI): A team of astronomers from Penn State and Nicolaus Copernicus University in Poland has discovered a new planet that is orbiting dangerously close to a red-giant star.
Still, "now at least we know that a giant planet at an [Earthlike] distance can survive" its parent star's red-giant phase, says Roberto Silvotti of the INAF-Osservatorio Astronomico di Capodimonte in Naples, Italy.
When the blue-giant wind caught up with the red-giant wind, it apparently compressed the material into an hourglass shape.
 
 
 
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