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ShareA red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giant stars.
As Earth's sun is of one solar mass, it is expected to become a red giant in about six billion years.
For more information about the topic Red giant, read the full article at Wikipedia.org, or see the following related articles:
Supergiant — Supergiants are the most massive stars. Supergiants can have masses from 10 to 70 solar masses and brightness from 30,000 up to hundreds of thousands ... > read more
Red supergiant star — Red supergiants are supergiant stars of spectral type K-M and a luminosity class of I. They are the largest stars in the universe in terms of ... > read more
Blue supergiant star — Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 - ... > read more
Stellar classification — In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Red giant at Wikipedia.org. See the Wikipedia copyright page for more details.
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