Due to Triton's retrograde orbit, its density, and its composition, astronomers theorize that Triton was not originally a satellite of Neptune, but was captured by Neptune's gravitational pull, forcing it into an orbit around the planet.
Orsaka av skeivu ringrásini hjá Triton, evnisnøgdini og samansetingini, seta stjørnufrøðingar fram ástøði um, at Triton upprunaliga ikki var ein av mánum Neptunar, men varð fangaður av tyngdarmegi Neptunar, sum tvingaði hann í ringrás um gongustjørnuna.