High Quality Content by WIKIPEDIA articles! The atmosphere of Triton extends 800 kilometers above Triton`s surface. The atmosphere mainly is composed of nitrogen, similar to Titan`s atmosphere and Earth`s atmosphere. The surface pressure is only 14 microbars, which is 1/70,000th of the surface pressure on Earth. Originally, it was thought Triton had a thick atmosphere.Voyager 2 observed the atmosphere up close in 1989. Recent observations of the atmosphere have shown an increase in temperature.