. ▁ ▁A ▁third ▁possibility ▁is ▁where ▁the ▁primary ▁and ▁moon ▁are ▁tid ally ▁locked ▁to ▁each ▁other . ▁In ▁that ▁case , ▁the ▁tid al ▁bul ge ▁stays ▁directly ▁under ▁the ▁moon , ▁there ▁is ▁no ▁transfer ▁of ▁angular ▁momentum , ▁and ▁the ▁orb ital ▁period ▁will ▁not ▁change . ▁Pl uto ▁and ▁Char on ▁are ▁an ▁example ▁of ▁this ▁type ▁of ▁configuration . ▁ ▁There ▁is ▁no ▁cons ensus ▁as ▁to ▁the ▁mechanism ▁of ▁formation ▁of ▁the ▁rings ▁of ▁Sat urn . ▁Although ▁theoretical ▁models ▁indicated ▁that ▁the ▁rings ▁were ▁likely ▁to ▁have ▁formed ▁early ▁in ▁the ▁Sol ar ▁System ' s ▁history , ▁data ▁from ▁the ▁Cass ini – H u yg ens ▁space craft ▁suggests ▁they ▁formed ▁relatively ▁late . ▁ ▁The ▁Sun ▁and ▁planet ary ▁environments ▁ ▁In ▁the ▁long ▁term , ▁the ▁greatest ▁changes ▁in ▁the ▁Sol ar ▁System ▁will ▁come ▁from ▁changes ▁in ▁the ▁Sun ▁itself ▁as ▁it ▁ages . ▁As ▁the ▁Sun ▁burn s ▁through ▁its ▁supply ▁of ▁hydro gen ▁fuel , ▁it ▁gets ▁hot ter ▁and ▁burn s ▁the ▁remaining ▁fuel ▁even ▁faster . ▁As ▁a ▁result , ▁the ▁Sun ▁is ▁growing ▁br ighter ▁at ▁a ▁rate ▁of ▁ten ▁percent ▁every ▁ 1 . 1   b ill ion ▁years . ▁In ▁about ▁ 6 0 0 ▁million ▁years , ▁the ▁Sun ' s ▁bright ness ▁will ▁have ▁dis rupted ▁the ▁Earth ' s ▁carbon ▁cycle ▁to ▁the ▁point ▁where ▁trees ▁and ▁for ests ▁( C 3 ▁photos yn th etic ▁plant ▁life )