![]() Triton, like our Moon, shows only one face to the planet: it rotates in synchrony to Neptune. Although there are other satellites with retrograde orbits, they are much smaller than Titan, and much more distant from their host planets (their "primaries"). It is both retrograde (see diagram) and highly tilted. The reason why Triton is thought to be a captured object is its orbit, which is unique in the Solar System. ![]() ![]() It will either collide with Neptune's atmosphere or break up, forming a ring system similar to that found around the planet Saturn. 3.6 billion years from now, Triton will pass within Neptune's Roche limit. Orbitĭrag and tidal interaction cause Triton to fall slowly into lowered orbits. Triton has its own magnetic field and has a faint trace of an atmosphere. The surface temperature of Triton was recorded by Voyager 2 as -235 ☌ (-391 ☏). Triton is believed to be a captured Kuiper Belt object, and is the coldest-known body in the Solar System. It was discovered by the British astronomer William Lassell on 10 October 1846, just 17 days after Neptune itself was discovered by the German astronomer Johann Gottfried Galle and Heinrich Louis d'Arrest. Triton has a complicated geological history, and it is thought to have a comparatively young surface compared to the age of the Solar System itself. Triton is slightly smaller than Earth's Moon. It is the seventh-largest moon in the Solar System. Triton, or Neptune I, is the largest moon of the planet Neptune. The Kuiper belt (green), in the Solar System's outskirts, is where Triton is thought to have originated.
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