Triton is the largest satellite in Neptune and the seventh in the Solar System, and is one of the coldest bodies of the same, with temperatures below -200 degrees Celsius. Its composition is nitrogen frozen in the crust, then a blanket of ice and finally a possibly solid core and metal. In reality, the composition of Triton is very similar to that of Pluto.
On the other hand, its orbit is retrograde, that is, with a direction opposite to Neptune's rotation movement, being the only large satellite in the Solar System with this characteristic. This makes scientists assume that Triton originally belonged to the Kuiper Belt (so called the transneptunian set of objects) and was captured by Neptune thanks to its gravitational force.
Triton is also one of the few geologically active solar system satellites. Almost in all probability, spectacular geysers of liquid nitrogen emanate from its frozen surface. This fact changed many principles of volcanism, as it showed that very cold bodies could also have geological activity.
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