Definition of red giant
: a star that has low surface temperature and a diameter that is large relative to the sun
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Researchers have captured images of other red giants in the past, including a great image of Antares unveiled last August.
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The sun will have exhausted its hydrogen in 5.4 billion years and enter a red giant phase, consuming helium for a few hundred million years before becoming a white dwarf.
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The red giant star, which sits 36 light-years away, will appear to be eclipsed by the gibbous moon in the early morning hours for observers in northwestern North America.
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Astronomers have gotten their best look yet at the surface of a red giant star.
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This red giant star some 642 light-years distant belongs to the great constellation Orion, the hunter, which dominates the winter season in the Northern Hemisphere.
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The Saturn Nebula is located about 5,000 light-years away in the constellation Aquarius and was formed when a star about half the size of our own became a red giant and shed its outer layers in a violent explosion.
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After that the sun will expand into a red giant, engulfing Mercury, Venus and possibly Earth.
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The eight-million-year-old red giant is on the brink of star death, also known as going supernova.
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.
First Known Use of red giant
1929
RED GIANT Defined for English Language Learners
red giant
Definition of red giant for English Language Learners
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astronomy : a very large star that has a reddish color
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