▁will ▁no ▁longer ▁be ▁able ▁to ▁surv ive ; ▁and ▁in ▁around ▁ 8 0 0 ▁million ▁years , ▁the ▁Sun ▁will ▁have ▁killed ▁all ▁complex ▁life ▁on ▁the ▁Earth ' s ▁surface ▁and ▁in ▁the ▁o ce ans . ▁In ▁ 1 . 1 ▁billion ▁years ' ▁time , ▁the ▁Sun ' s ▁increased ▁radiation ▁output ▁will ▁cause ▁its ▁circum stell ar ▁habit able ▁zone ▁to ▁move ▁out wards , ▁making ▁the ▁Earth ' s ▁surface ▁too ▁hot ▁for ▁liquid ▁water ▁to ▁exist ▁there ▁naturally . ▁At ▁this ▁point , ▁all ▁life ▁will ▁be ▁reduced ▁to ▁single - cel led ▁organ isms . ▁Ev ap oration ▁of ▁water , ▁a ▁pot ent ▁green house ▁gas , ▁from ▁the ▁o ce ans ' ▁surface ▁could ▁acceler ate ▁temperature ▁increase , ▁potentially ▁ending ▁all ▁life ▁on ▁Earth ▁even ▁sooner . ▁During ▁this ▁time , ▁it ▁is ▁possible ▁that ▁as ▁Mars ' s ▁surface ▁temperature ▁gradually ▁r ises , ▁carbon ▁dio x ide ▁and ▁water ▁currently ▁fro zen ▁under ▁the ▁surface ▁reg ol ith ▁will ▁release ▁into ▁the ▁atmosphere , ▁creating ▁a ▁green house ▁effect ▁that ▁will ▁heat ▁the ▁planet ▁until ▁it ▁ach ieves ▁conditions ▁parallel ▁to ▁Earth ▁today , ▁providing ▁a ▁potential ▁future ▁ab ode ▁for ▁life . ▁By ▁ 3 . 5   b ill ion ▁years ▁from ▁now , ▁Earth ' s ▁surface ▁conditions ▁will ▁be ▁similar ▁to ▁those ▁of ▁Ven us ▁today . ▁ ▁Ar ound ▁ 5 . 4   b ill ion ▁years ▁from ▁now , ▁the ▁core ▁of