We know about Pluto. But we don’t really know it ... We’ll finally get to meet the former ninth planet face-to-face—to really see its surface and that of its largest moon, Charon.

Then, of course, came the New Horizons mission. New Horizons Unveils Pluto’s True Face The watershed moment in Pluto’s exploration came in July 2015, when NASA’s New Horizons spacecraft flew ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague?

Pluto, with its heart-shaped glacier, as captured by the New Horizons spacecraftJPL/NASA Pluto will mark a birthday of sorts on March 23, 2178. No one is likely to be there to celebrate it, of ...

Pluto was discovered at Lowell Observatory in Flagstaff, Arizona in 1930 and was considered our ninth planet until 2006. The International Astronomical Union reclassified Pluto as a dwarf planet ...

Pluto, discovered in 1930, was once considered the ninth planet in our solar system. In 2006, the International Astronomical Union reclassified Pluto as a dwarf planet because it doesn't meet all ...