(Neptune's one significant moon)
Triton (Neptune I) is Neptune's largest moon,
much larger than Neptune's other moons, and for
a long time, Neptune's only known moon.
Its radius is 1680 miles about 1/5 Earth radius,
and its mass is on the order of 1/275 of Earth's.
Cryovolcanism has been detected on it.
Triton is in a retrograde orbit
and because of this as well as its Pluto-like composition,
it is thought to be a captured dwarf planet.
Recent study of such captures suggest Triton
might have previously been a minor planet with a binary
companion: simulations show captures involving just two bodies
require very particular circumstances, but three-body
interactions involving a binary object with a third object
can more easily result in such an exchange.
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