Pluto was once thought to be the most distant planet from us. Until astronomers discovered many other icy objects orbiting the sun together around Pluto, poor Pluto was demoted in 2006. Since Pluto was discovered by Tombaugh in 1930, it was downgraded in 2006, only a mere 76 years. And Pluto’s orbital period is 247.94 years, so from discovery to demotion, it orbits the sun only a small angle. Although Pluto has been downgraded to a dwarf planet, scientists have not ignored this “little brother” at all. For scientists, this dwarf planet is full of mystery. Pluto is small and distant, about 3 billion miles away. Even the best telescopes can only see a faint blob. This image is the best image of Pluto ever, taken by the Hubble Space Telescope, which can only capture 20 pixels of Pluto. Scientists can only know that some places are bright and some places are dark, there is no way of knowing what they are. All scientists can know about Pluto is that it has nitrogen ice on it, a satellite and other limited information. So to unveil the mystery of Pluto, .
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