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.

Triton, largest moon of Neptune, taken from the Voyager 2 spacecraft. It is one of only three objects in the solar system with a nitrogen-dominated atmosphere - the other two being Earth and Saturn's giant moon Titan. It also has the coldest surface known in the solar system at -391 degrees Fahrenheit. At that temp, nitrogen condenses as frost.

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Triton, largest moon of Neptune, taken from the Voyager 2 spacecraft. It is one of only three objects in the solar system with a nitrogen-dominated atmosphere - the other two being Earth and Saturn's giant moon Titan. It also has the coldest surface known in the solar system at -391 degrees Fahrenheit. At that temp, nitrogen condenses as frost.

NASA’s Pluto-bound New Horizons spacecraft captured this view of the giant planet Neptune and its large moon Triton on July 10, 2014, from a distance of about 2. Description from simplenewz.com. I searched for this on bing.com/images

NASA’s Pluto-bound New Horizons spacecraft captured this view of the giant planet Neptune and its large moon Triton on July 10, 2014, from a distance of about 2. Description from simplenewz.com. I searched for this on bing.com/images

Triton (moon of Neptune)  Triton is Neptune's largest moon. It's so far from the sun (and therefore, soooo cold) that all the nitrogen in its atmosphere has settled on the surface as frost

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Triton (moon of Neptune) Triton is Neptune's largest moon. It's so far from the sun (and therefore, soooo cold) that all the nitrogen in its atmosphere has settled on the surface as frost

Dark streaks on Triton formed by deposits from ice or cryovolcanos. Credit: NASA

Dark streaks on Triton formed by deposits from ice or cryovolcanos. Credit: NASA

Montage of Neptune and Triton captured by NASA's Voyager 2, which flew past the planet in 1989. Voyager 2 was the first and still the only space-craft to reach Uranus and Neptune, and gave us the only close up pictures of the planets.

Montage of Neptune and Triton captured by NASA's Voyager 2, which flew past the planet in 1989. Voyager 2 was the first and still the only space-craft to reach Uranus and Neptune, and gave us the only close up pictures of the planets.

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