<P> Triton is one of the few moons in the Solar System known to be geologically active ( the others being Jupiter 's Io and Europa , and Saturn 's Enceladus and Titan ) . As a consequence , its surface is relatively young , with few obvious impact craters . Intricate cryovolcanic and tectonic terrains suggest a complex geological history . Part of its surface has geysers erupting sublimated nitrogen gas , contributing to a tenuous nitrogen atmosphere less than 1 / 70,000 the pressure of Earth 's atmosphere at sea level . It is the second - largest planetary moon in relation to its primary , after Earth 's moon . </P>
<P> Triton is one of the few moons in the Solar System known to be geologically active ( the others being Jupiter 's Io and Europa , and Saturn 's Enceladus and Titan ) . As a consequence , its surface is relatively young , with few obvious impact craters . Intricate cryovolcanic and tectonic terrains suggest a complex geological history . Part of its surface has geysers erupting sublimated nitrogen gas , contributing to a tenuous nitrogen atmosphere less than 1 / 70,000 the pressure of Earth 's atmosphere at sea level . It is the second - largest planetary moon in relation to its primary , after Earth 's moon . </P>
how are saturn 's moon titan and neptune 's triton similar
how are saturn 's moon titan and neptune 's triton similar
geologically active
geologically active