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Message: <blockquote data-quote="S'mon" data-source="post: 6255078" data-attributes="member: 463">"Death of the Sun" - current thinking seems to be that the Earth will slip out of the habitable zone as the sun gets hotter in perhaps 1 billion years, long before the Sun starts swelling to a red giant.As far as tech advancement letting species survive, any sf tech beyond "we can move some people to a another solar system" seems to me to be entirely fantasy, with no evidence it has been or could ever be achieved, so setting a timeline for it seems completely arbitrary. The sf idea that 'the future' = 'ever more energy' emerged from the 19th through early 20th century experience of harnessing fossil fuels, and we see it a lot in sf originating in the ca 1910s-1960s, but society hasn't garnered significantly more energy per capita in at least sixty years now (since cars became widespread) and there's no indication that will change.</blockquote>