▁its ▁evolution ▁from ▁the ▁main ▁sequence ▁of ▁the ▁H ert z spr ung – Russ ell ▁diagram ▁and ▁into ▁its ▁red - gi ant ▁phase . ▁The ▁Sol ar ▁System ▁will ▁continue ▁to ▁evol ve ▁until ▁then . ▁ ▁Long - term ▁stability ▁The ▁Sol ar ▁System ▁is ▁cha otic ▁over ▁million - ▁and ▁billion - year ▁times cal es , ▁with ▁the ▁or bits ▁of ▁the ▁plan ets ▁open ▁to ▁long - term ▁variations . ▁One ▁notable ▁example ▁of ▁this ▁cha os ▁is ▁the ▁Ne pt une – Pl uto ▁system , ▁which ▁lies ▁in ▁a ▁ 3 : 2 ▁orb ital ▁reson ance . ▁Although ▁the ▁reson ance ▁itself ▁will ▁remain ▁stable , ▁it ▁becomes ▁impossible ▁to ▁predict ▁the ▁position ▁of ▁Pl uto ▁with ▁any ▁degree ▁of ▁accuracy ▁more ▁than ▁ 1 0 – 2 0   mill ion ▁years ▁( the ▁Ly ap un ov ▁time ) ▁into ▁the ▁future . ▁Another ▁example ▁is ▁Earth ' s ▁ax ial ▁t ilt , ▁which , ▁due ▁to ▁fr iction ▁raised ▁within ▁Earth ' s ▁mant le ▁by ▁tid al ▁interactions ▁with ▁the ▁Moon ▁( see ▁below ), ▁is ▁in comput able ▁from ▁some ▁point ▁between ▁ 1 . 5 ▁and ▁ 4 . 5 ▁billion ▁years ▁from ▁now . ▁ ▁The ▁outer ▁plan ets ' ▁or bits ▁are ▁cha otic ▁over ▁longer ▁times cal es , ▁with ▁a ▁Ly ap un ov ▁time ▁in ▁the ▁range ▁of ▁ 2 – 2 3 0   mill ion ▁years . ▁In ▁all ▁cases