Exploration & discovery

New Horizons flies by Pluto

14 July 2015

After a nine-year journey, NASA's New Horizons probe passed within 12,500 km of Pluto on 14 July 2015, giving the first close view of the dwarf planet. It revealed a surprisingly active world with mountains of water ice as high as the Rockies, a vast heart-shaped plain of nitrogen ice called Sputnik Planitia, a blue haze of layered atmosphere and signs of recent geological activity. The probe then flew on to the Kuiper belt object Arrokoth on 1 January 2019, the most distant object ever visited.

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