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Red giant

A 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.

Note:   The above text is excerpted from the Wikipedia article "Red giant", which has been released under the GNU Free Documentation License.
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November 25, 2015

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updated 12:56 pm ET