Triton, the largest moon of Neptune. Because Triton has a retrograde orbit (opposite that of it's planet), it was likely captured by Neptune's gravitational pull from the Kuiper Belt. It's about the same size and has a very similar makeup to Pluto, another Kuiper Belt object. Triton's orbit is slowly shrinking, and it is expected that in about 3.6 billion years, it will either collide with Neptune or be destroyed, forming a Saturn-like ring system.

Triton, the largest moon of Neptune. Because Triton has a retrograde orbit (opposite that of it's planet), it was likely captured by Neptune's gravitational pull from the Kuiper Belt. It's about the same size and has a very similar makeup to Pluto, another Kuiper Belt object. Triton's orbit is slowly shrinking, and it is expected that in about 3.6 billion years, it will either collide with Neptune or be destroyed, forming a Saturn-like ring system.

Mercury, Venus, Earth, The Moon (Luna), Mars, Jupiter, Io, Europa, Ganymede, Callisto, Saturn, Enceladus, Titan, Iapetus, Hyperion, Uranus, Miranda, Neptune or Triton #Astronomy

Mercury, Venus, Earth, The Moon (Luna), Mars, Jupiter, Io, Europa, Ganymede, Callisto, Saturn, Enceladus, Titan, Iapetus, Hyperion, Uranus, Miranda, Neptune or Triton #Astronomy

Tritón creciente. Es una luna retrógrada (gira en sentido contrario al resto de los satélites de Neptuno), lo que hace pensar que se trata de un "cuerpo capturado" por la gravedad de Neptuno, y que quizá se formo en otro sitio (¿el cinturón Kuiper?).

Tritón creciente. Es una luna retrógrada (gira en sentido contrario al resto de los satélites de Neptuno), lo que hace pensar que se trata de un "cuerpo capturado" por la gravedad de Neptuno, y que quizá se formo en otro sitio (¿el cinturón Kuiper?).

Triton (bottom) and Neptune (top). Taken 3 days after Voyager 2's flyby.

Triton (bottom) and Neptune (top). Taken 3 days after Voyager 2's flyby.

Dark streaks on Triton (moon of Neptune) formed by deposits from ice or cryovolcanos. Credit: NASA

Dark streaks on Triton (moon of Neptune) formed by deposits from ice or cryovolcanos. Credit: NASA

Triton taken in 1989 by Voyager 2. Fascinating terrain, a thin atmosphere, and even evidence for ice volcanoes on this world of peculiar orbit and spin.

Triton taken in 1989 by Voyager 2. Fascinating terrain, a thin atmosphere, and even evidence for ice volcanoes on this world of peculiar orbit and spin.

Neptune’s moon, Triton, taken in 1989 by Voyager 2 - the only spacecraft ever to pass it.

Neptune’s moon, Triton, taken in 1989 by Voyager 2 - the only spacecraft ever to pass it.

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