Man will go into the sun’s atmosphere in the 23rd century.
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See Stephen Baxter’s Xeelee series and Michael Poole
Woman born genetically altered to age super fast, when she dies of old age 10 years later, her consciousness is transferred to a capsule that is sent to the Sun, there she is free to fly anywhere inside the Sun she chooses.
Its there she meets her constant companions the photino birds which are creatures of Dark Matter, slowly changing the Sun (which like all other stars they use as nesting places) into a stable Red Dwarf star, by first going the nova.