In about one billion years , Triton is calculated that it will either collide into Neptune 's atmosphere , or break up into ring systems similar to those patterns of Saturn 's . Tidal interactions have also meant that Triton 's orbit , already close to Neptune , is slowly decaying further , and predictions are that some 3.6 billion years from now , Triton will pass within Neptune 's Roche limit . This will result in either a collision with Neptune 's atmosphere or the breakup of Triton , forming a ring system similar to that found around Saturn .