Our understanding of Pluto has changed a lot since it was discovered in 1930. When American astronomer Clyde Tombaugh first trained the Lowell Observatory's gaze on Pluto's patch of sky, the small dwarf planet appeared as a pinprick of light in distant space. As the years went by, scientists continued to get better and better views of Pluto from powerful telescopes on Earth and in space. Now, NASA's New Horizons spacecraft will get the first close-up images of the tiny planet on the outskirts of the solar
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