Pluto
Pluto has been under discussion weather it is classified as a planet or not. As of 2006, Pluto has now been classified as a dwarf planet because of its small size. Pluto has a seasonal atmosphere. It has clouds of nitrogen, but because of Pluto's low gravitational pull, the nitrogen easily escapes into space. It was recently discovered that because the nitrogen on its surface was exposed to sunlight, following a 120 year winter, it became a gas. It took a little bit of time for the nitrogen to solidify and hold in its gases. Pluto's surface has actually not been explored, however its interior has been. Its interior has been explored. Its interior is said to be composed of ice. Its core is made up of iron/nickel alloy, and rock.
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