The planet Neptune has 14 known satellites. The biggest of them all is Triton, and it is quite different from the others. It has a diameter that is 6.5 times greater than the second satellite of Neptune by size, Proteo. Triton has several active volcanoes that erupt constantly in the form of geysers, and throw liquid nitrogen to the surface.
The exact diameter of Triton is 2,700 kilometers, and it rotates at a distance of 355,000 kilometers from Neptune over a period of just under six days. The largest moon in Neptune has two characteristics that make it special. In the first place, it is the only large satellite that turns in the opposite direction to the rotation of its planet. The second peculiarity is its temperature, since it is the coldest object in the Solar System. On its surface temperatures have been experienced at -235 degrees Celsius.
Triton has an atmosphere that is mainly composed of nitrogen, methane and carbon monoxide. Most of its surface is smooth. It is possible that the craters that had formed in it due to meteor impact have disappeared, due to the action of geological forces that have recently occurred.
It is speculated that Triton's peculiar orbital characteristics are due to the fact that it is a satellite captured by the Neptune gravitational field. This field could be inevitably attracting him to the planet, so it is very likely that, finally, Triton will end up crashing against him.
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