Triton, the largest moon of Neptune. Because Triton has a retrograde orbit (opposite that of it's planet), it was likely captured by Neptune's gravitational pull from the Kuiper Belt. It's about the same size and has a very similar makeup to Pluto, another Kuiper Belt object. Triton's orbit is slowly shrinking, and it is expected that in about 3.6 billion years, it will either collide with Neptune or be destroyed, forming a Saturn-like ring system.
This color photo of Neptune's largest moon Triton was obtained by NASA's Voyager 2 probe on Aug. 24, 1989, from 330,000 miles away. The resolution is about 6.2 miles, sufficient to begin to show topographic detail. CREDIT: NASA/JPL
Triton : Moon of Neptune - This seventh-largest moon in the Solar System is the only large moon to have a retrograde orbit, moving opposite the direction of its planet's rotation. Geologically active, it has a surface of mostly frozen nitrogen, a mostly water ice crust, an icy mantle and a substantial core of rock and metal (two-thirds of the total mass). It is 1,700 miles (2,700 km) in diameter
ღღ Unfortunately the name of these shells are not mentioned. If anyone knows theses shells by name, please add it in the comment line. Thanks! ~~~~ Shells are Swell – Beautiful Examples of Seashell Photography | Inspiration