At that time the Earth will have either drifted into a wider orbit due to the sun's loss of mass, and be a charred cinder, or else have been swallowed up along with Mercury and Venus as the outermost reaches extend beyond the Earth's orbit. The red giant phase will last only a few million years before, unable to fuse Carbon, the sun's outer layers puff away and the white dwarf core is left to slowly cool.
Betelgeuse's death will be cooler, and quite possibly within our own lifetime. Or rather, witnessed in our own lifetime, it would have died centuries ago.
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