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  1. Bing Gallery
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  3. 2020
  4. February 18
  5. Pluto's crescent imaged by Nasa's New Horizons interplanetary space probe
arrow_back_ios arrow_forward_ios Pluto's crescent imaged by Nasa's New Horizons interplanetary space probe

February 18, 2020

Pluto's crescent imaged by Nasa's New Horizons interplanetary space probe

© NASA/JHUAPL/SWRI/Science Photo Librar

Exploring Pluto's mysteries

Pluto was first spotted on this day in 1930 by Clyde Tombaugh, a 23-year-old astronomer at Lowell Observatory in the US state of Arizona. Because it’s so far away (about 40 times as far from the Sun as Earth is) scientists knew relatively little about Pluto until the New Horizons spacecraft reached it in 2015. In a fly-by study, the craft spent more than five months gathering detailed information about Pluto and its moons. What did they find out? There’s a heart-shaped glacier, blue skies, spinning moons, mountains and snow - but on Pluto, the snow is red.

Once thought to be one of nine fully-fledged planets orbiting the Sun, in 2006 Pluto was stripped of its planetary status and reclassified as a mere 'dwarf planet’. (Sorry, Pluto.) Though it is no longer considered a ‘true’ planet, it remains a complex world, with many mysteries to be solved.

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