Triton is the largest natural satellite of the planet Neptune. It is the only moon of Neptune massive enough to be rounded under its own gravity and hosts a thin, hazy atmosphere. Triton orbits Neptun
William Lassell, the discoverer of Triton
Clouds observed above Triton's limb by Voyager 2
Dark streaks across Triton's south polar cap surface, thought to be dust deposits left by eruptions of nitrogen geysers
Two large cryolava lakes on Triton, seen west of Leviathan Patera. Combined, they are nearly the size of Kraken Mare on Titan. These features are unusually crater free, indicating they are young and were recently molten.
The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units to approximately 50 AU from the Sun. It is similar to the asteroid belt,
Triton (moon)
…direction to the parent planet's rotation—the only large moon in the Solar System to do so. Triton is thought to have once been a dwarf planet from the Kuiper belt, captured into Neptune's orbit by the latter's gravity. At 2,710 kilometers (1,680 mi) in diameter, Triton is the seventh-largest moon in the Solar…
Pluto and Charon in false color
Astronomer Gerard Kuiper, after whom the Kuiper belt is named
In 1980, astronomer Julio Fernandez predicted the existence of a belt. It has been said that because the words "Kuiper" and "comet belt" appeared in the opening sentence of Fernandez's paper, this hypothetical region was referred to as the "Kuiper belt".
Telescopes atop Mauna Kea. The Kuiper belt was discovered with UH88, which is the fourth from the left