Pluto, once considered the ninth planet of our solar system, is now classified as a "dwarf planet." Discovered in 1930 by Clyde Tombaugh, Pluto is located in the Kuiper Belt, a region of icy bodies beyond Neptune. It has a highly elliptical orbit that sometimes brings it closer to the Sun than Neptune, and a single orbit takes about 248 Earth years.
Pluto is relatively small, with a diameter of about 2,377 kilometers, making it smaller than Earth's Moon. It is composed mainly of rock and ice, with surface temperatures averaging around -229°C (-380°F). The surface features include mountains made of water ice, vast plains of frozen nitrogen, and evidence of past geological activity.
Pluto has five known moons, the largest being Charon, which is so large relative to Pluto that they are sometimes referred to as a double dwarf planet system. In 2006, the International Astronomical Union (IAU) redefined what constitutes a planet, leading to Pluto's reclassification as a dwarf planet.
The New Horizons spacecraft's 2015 flyby provided unprecedented insights into Pluto’s geology, atmosphere, and moons, revealing a dynamic world far more complex than previously imagined. Despite its reclassification, Pluto continues to capture the imagination of scientists and the public alike.
Pluto
2024. 11. 12.
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