MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
New Horizons probe passing Pluto, illustration. In 2015, the NASA probe New Horizons finally arrived at Pluto after a decade-long flight. As the probe passed the dwarf planet, it peered back towards the Sun and photographed Pluto with its scant atmosphere illuminated by the Sun behind it.
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