Has the sun not got a good 4-5 billion years left?
The sun has, we (i.e. life on earth) haven't. It starts getting properly hot here (i.e. all surface water evaporated) in only 1 billion years, hot enough to put paid to most life long before that.
@gbj_tester started
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The sun has, we (i.e. life on earth) haven't. It starts getting properly hot here (i.e. all surface water evaporated) in only 1 billion years, hot enough to put paid to most life long before that.