this post was submitted on 27 Dec 2024
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From what I can find with some quick searching, the red giant phase should only last about a billion years. The white dwarf stage should last much longer (tens or hundreds of billion years) as the sun slowly cools.
You're absolutely right that there won't be a supernova, though. The sun will shed much of its mass in the form of a planetary nebula, but it won't explode or implode.